Categories
birds Florida outdoors

Meditations on the White-faced Ibis

This weekend, we did a bit of bike riding and birding at Orlando Wetlands Park. OWP is a water treatment facility that circulates treated wastewater through a series of ponds with natural vegetation to clean it further before releasing it into the St. Johns River. It attracts a lot of wildlife, and is a fairly popular place to walk or bike along the berms. We didn’t see any unusual species this time, but had a nice time getting outside while the weather’s not too hot in Florida.

Glossy Ibis in breeding plumage (photo: J.M.Garg, Wikipedia)

As we were biking along, we caught some looks at very shiny Glossy Ibises in breeding plumage. This reminded us of an episode last spring, when a White-faced Ibis was reported at OWP on a birding listserv. White-faced Ibises are rarely found in Florida; their typical range in the US is in the western states (and occasionally in Hawaii). I decided to go out and try to find the ibis.

White-faced Ibis (photo: Kevin Cole, Wikipedia)

White-faced Ibises are dark-plumaged long-billed wading birds. They’re pretty similar to the typical dark ibis found in Florida, the Glossy Ibis. When the birds aren’t in breeding plumage, you have to tell the species apart by looking at the skin on their face. Glossy Ibises have blue skin and dark eyes; White-faced Ibises have pink skin and red eyes. As you might guess, this means you should really be close to the bird, or have a spotting scope, if you want to identify it.

Nonbreeding Glossy Ibis (Photo: Debivort, Wikipedia)

Of course, when I got out to the park, all the ibises were way, way back in the marsh- completely unidentifiable with just binoculars. That day was hot, and very sunny, meaning there was heat shimmer on the water making everything blurry, and the birds were just not coming any closer. I spent an inordinate amount of time out there trying to see the postage-stamp sized piece of face skin on each and every ibis, but in vain. I’m sure I saw the White-faced Ibis, but could not confirm that I did. I ended up going home a bit disappointed, without being able to add the ibis to my list.

I suggest that are three reasons that birders are considered a bit geeky. First, they have a hobby, about which they can be obsessive. Hobbies are often regarded as geeky among non-hobbyists. Second, they frequently carry a lot of equipment (e.g., binoculars, spotting scope, tape recorder/iPod/etc., bird ID books, notebook, camera with very long lens). Up to a certain point, accessories carry a sort of panache- but past that point, they apparently become geeky. While I personally consider, say, wearing oversized designer sunglasses geeky and non-functional, I recognize that those wearing them probably consider them a status symbol. Similarly, I realize that the designer-sunglasses set probably considers my wide-brimmed hiking hat geeky. To each her own. Anyway. The third reason that birders are considered geeky is their penchant for keeping a list of all the birds they’ve seen.

List-keeping falls under that most obsessive of human behaviors: categorizing and classifying. To some extent, we do this automatically (this fruit is good to eat; that leaf is probably not too tasty). For birders (and scientists, natural historians, stamp collectors, designer shoe aficionados, etc.) the list can become the focus of the hobby. Some birders focus more on adding species to their lists than on observing the behavior or biology of the birds they observe, or walking through the forest in Zen-like contemplation of the world around you.

Now, I’ll be the first one to say that I have no problem with keeping lists. Especially if birders share this information with others- this information can become valuable for understanding what’s happening with bird populations over time. I also consider birding a hobby that has less net negative impact on the environment than the hobby of conspicuous consumption. Even compulsive bird listers get out and interact with nature in ways that help stitch together the natural and human spheres of our experience that sometimes seem to be slipping apart.

As a case in point, I’ll go back to the White-faced Ibis again. While I never did see the one that was hanging out at OWP last spring, I did end up unexpectedly seeing several of them on Maui a few months later. And that was pretty cool- they’re pretty uncommon in the Hawaiian Islands.

More recently, a White-faced Ibis was spotted in Massachusetts. This bird’s story does not end well. The following (somewhat disturbing) video documents one college ornithology class’s field trip to see the ibis, and how a local Peregrine Falcon decided to take the opportunity for a bit of lunch. From the reactions on the video, I think the college students were a bit traumatized by this particular example of the food chain in action. (via Birdchick)

Categories
birds public participation in science science communication

Angry Birds to migratory birds?

Digital tools can help us understand bird migration. How so?

Many animals take seasonal long-distance migrations- this is especially evident for birds. For many bird species- including raptors, songbirds, wading birds, and seabirds- the reproductive benefits of migrating thousands of miles from summer breeding grounds to winter feeding grounds outweigh the costs of such a difficult journey. Therefore, natural selection has resulted in massive large-scale migrations of these animals.

Flying cross-country is MUCH harder than the slingshot mode of transportation... (Image: rovio.com)

Migration usually takes place twice a year, as you might expect: in spring (to summer breeding grounds) and in the autumn (to winter feeding grounds). While different species, and even different populations within species, have different migration routes, there are several known migration corridors or “flyways” that are traveled by many species. Flyways are determined partly by the relative north-south positions of the feeding and breeding grounds, and partly by prevailing wind patterns, geography, and habitat along the way.

In North America, there are three major flyways, as seen on the map below. Now think about a tiny warbler or sparrow making this journey from, say, Ontario. It requires an enormous amount of effort just to cross the United Sates- and then you reach the Gulf of Mexico! While some birds cut straight across the Gulf (remember- these are forest birds, so can’t stop and swim for shore), others head south via Florida or along the Mexican coast.

Major North American flyways (Image: borealbirds.org).

Other birds have even longer migrations. This map shows the migratory routes of several species who breed in the Arctic. Again, keep in mind that birds who fly over the Pacific have very few spots to land. Many, many birds get exhausted and literally drop dead along the way. Clearly, migration is a hazardous proposition.

Migration patterns of Arctic birds (Image: arctic.fws.gov)

The process of understanding migration routes has been quite complex. We can record when birds arrive at and then leave a specific site (phenology), but that doesn’t tell us where individual birds are coming from and going to, unless the birds are banded or being tracked by radio telemetry. Both of these types of research are very labor-intensive. However, now there are new digital tools that let both casual and hardcore amateur birdwatchers help in this effort.

One example is eBird, an online database that compiles bird observations, and which is then used by ornithologists to study bird distributions. This type of crowdsourcing also helps enthusiastic birders participate in science research. One recent addition to eBird’s website is a set of animated maps showing migration patterns for several species.

Animated GIF of Chestnut-Sided Warbler migration (ebird.org)

These maps are limited to the contiguous U.S., so hopefully they’re working on ways to expand them to show a wider area. Migratory birds certainly aren’t restricted by human borders, and these maps would be a great tool to show that.

Another digital tool that helps understand bird migrations is quite different- radar! Apparently, the number of migrating birds during peak migration is so large that flocks of birds can be picked up on radar. It takes a keen eye to differentiate the radar patterns birds make from weather phenomena, but this tool is being explored as a way to track migration patterns.

Tracking birds with radar: April 12-13, 2011. (Image: badbirdz2.wordpress.com)

Radar can show us how birds are affected by weather systems and which locations birds are stopping in. This information could obviously be a great resource for birders- if you know that birds traveled to the SE coast of Florida last night, you could get up this morning and head over to birding spots on the coast. This seems like a pretty interesting tool to use for understanding birds.

Will adding digital tools to more traditional on-the-ground ways to measure bird migration help us understand birds better? Will these tools excite a new generation of potential birdwatchers? Non-digital citizen science projects are already showing us the effects of global warming on bird migration. If these projects have a larger scope and interest a bigger segment of the population, they might be able to accomplish quite a lot. And they’ll teach us more about birds than that they really, really hate those self-satisfied pigs.

Fore more information or to participate in these efforts, check out these sites:

Categories
birds environment geekery metaphor

Darwin, Wallace, and … Tolkien?

Via Jessica Palmer, here’s an interesting project: a multimedia essay on ecological mythos, Romanticism and 19th-Century science, filmmaking, and Middle-Earth.

It’s called The Mythoecology of Middle-earth: A report from the Shire, a landscape born of high fantasy, natural science, and geek tourism, by Peter Nowogrodzki, and it’s a virtual cabinet of curiosity (or confection, as Tufte would say) inviting readers to explore connections between natural history, travel, and mythology:

In the century before Tolkien’s birth, the study of nature itself had become the subject of ardent imaginative exploration: The Age of Discovery’s there-and-back conquests uncovered troves of biological data, fodder for the Age of Wonder, in which “Romantic science” strived to imitate poetry—not just describing nature but transforming the world by fundamentally altering our perception of it.

It has birds (eagles, giant: real and mythical), trees (as illustrated by Haeckel, Blake, and the Weta Workshop), meditations on the virtual and the mythology of filmmaking, demands by Maori for respect for indigenous landscapes and by labor unions for better pay.

I’m not sure it has a point, but it creates some interesting juxtapositions.

Categories
birds Hawaii outdoors

Lowland birding on Maui

I’m not sure if I’ve mentioned this before, but the West Maui mountains creep me out. They’re intermediate in erosion between the massive-yet-pimpled with cinder cones peaks (Mauna Kea, Hualalai, and Haleakalā) and the deeply eroded ranges found on O’ahu and Kaua’i. I just find West Maui too pointy- like it’s obviously just beginning to be dissected into sharp edges, but before it’s been softened into fluted valleys and gentle hills.

Pointy peaks of West Maui-the biggest valley is Iao Valley.

…but I digress. I intended in this post to talk about a few birding sites on Maui that are easily accessible, in lowland areas. We visited both of these locations in December 2010.

The above photo is from one of those sites, a wildlife sanctuary called Kanahā Pond. This sight is literally just down the street from the Wailuku Kahului airport, so it was our first stop when we got in to Maui. While it backs onto a business/industrial area, it’s one of the largest (and few remaining) wetland sites on Maui. It harbors a large number of migratory species, as well as four of the ‘big five’ breeding waterfowl: the endemic Hawaiian Coot (endangered species), endemic Hawaiian Moorhen (endangered subspecies of the Common Moorhen), endemic Hawaiian Stilt (endangered subspecies of the Black-Necked Stilt), and the native Black-crowned Night-Heron. The endangered Hawaiian Duck is not found here, though some of the Mallards seen here might be hybrids with this species.

Hawaiian stilt in Kanaha pond.

If you’re into birding, this is definitely a good location to check out- if you’re not a birder, why not park it here for a while with a snack or beverage from a nearby shop and check out the action? Species we saw: Laughing Gull, Stilt, Cattle Egret, Myna, Night-Heron, Spotted Dove, House Sparrow, Pacific Golden-Plover, Coot, and Red-Crested Cardinal.

Black-crowned night heron, or auku'u.

The other wetland site that’s easily accessible on Maui is Kealia Pond, a National Wildlife refuge on the south shore of the isthmus. You can do more walking around here. There are two entrances to this site. One parking area, along the shoreline off of Kihei Rd/Hwy 310, gives access to the beach and a boardwalk with interpretive signage. This is the nicer location. The other access point, off of Hwy 311/Mokulele Rd, is less aesthetically pleasing (i.e., muddy and full of midges), but much better for birding.

You can access the pond itself via a series of berms that you can walk along. When we were there, it was quite muddy. The midges don’t bite, but they will swarm all over you- this was distracting and oogy for us, and would probably be really creepy if you have a problem with insects.

Kealia pond- idyllic except for the massive clouds of midges.

You can see a much larger part of the pond here than at Kanahā Pond, but that also means the birds can see you and be startled. We saw quite a few more species here: American Wigeon, Zebra Dove, Stilt, Cattle Egret, Chestnut Munia, Myna,  Coot, Least Sandpiper, Mallard, Northern Cardinal, Northern Pintail, Northern Shoveler, Orange-cheeked Waxbill, Pacific Golden-Plover, Ring-billed Gull, Sanderling, White-faced Ibis, and Night-Heron. I also saw a goose, which flew away before I could make a positive i.d.- possibly a White-fronted goose. I’d definitely recommend this site for those interested in birds.

So, two good lowland wetland birding sites on Maui. I have one more Maui post planned, then I’ll be moving on to other topics.

Categories
birds random

Birds, babies and books

(OK, I was trying to come up with a good alliterative title for this post, but that’s the best I could come up with.)

Books: My relative blog silence over the last few weeks has been because I’ve been working on my dissertation prospectus- the document that lays out my plans for a dissertation project and which will guide the direction of my life for the forseeable future (or until May 2012, according to the schedule therein). At any rate, said prospectus is in the hands of my committee right now, and we will meet this week to discuss it.

Technically, the prospectus is not a book (it ended up being about 35 pages, double-spaced), so if anyone has a better pithy term for ‘dissertation prospectus’ that starts with ‘b,’ let me know. I’ve certainly been reading quite a few books while working on it, though.

Babies: Combined with this project, we went last weekend to visit my new nephew. Much snuggling of babies was involved. Also, ice cream, sledding, snow, opera, and dinosaurs (not in that order). Baby X is, as yet, too young to appreciate any of these things. Sad, but true.

Not having been around many babies, I did not know that the soft spot on their head can throb. How bizarre is that?

Birds: Last weekend was the Great Backyard Bird Count, a citizen science project that’s a type of ‘bird census’ for the U.S. and Canada. I was able to do some birding near my sister’s house, but baby time interfered with birding time. I can see that I’ll have to introduce Baby X to the wonders of birding as he gets older… At any rate, Spring Break is next week (no, it’s not really spring yet), and we’ll be heading to the San Diego Bird Festival. So there should be plenty of birding then!

Aside from that, Spring Break will include at least one of these things, possibly more: 1) writing the introduction to the dissertation; 2) working on the technical part of the dissertation; 3) responding to review comments to a publication based on my master’s thesis, which has incredibly little to do with my current research but I really want to get it out there; or 4) having fun outdoors in the brief period that Florida actually has nice weather. So we shall see how this goes.

Categories
birds environment Florida outdoors

Windley Key Fossil Reef Geological State Park

Windley Key Fossil Reef Geological State Park. …If that isn’t a mouthful of a park name, I don’t know what is. Located on Windley Key (no surprise there) in the Florida Keys, this park has some interesting things to see.

We visited this park in the spring of 2010, on a trip through the Keys. Unfortunately we didn’t take any photos 🙁 so the ones here are from the park website.

Windley Key quarry
Windley Key quarry (FL state Parks)

The central feature of this park is a rock quarry which provided stone for the Keys Overseas Railroad, and was used until the 1960s. The “fossil reef” part of the title comes from the limestone rock, formed by fossilized coral. There are two big quarries in the park, and you can walk along the walls looking at fossilized shells and coral, finding some neat stuff. One of the highlights was a huge fossil brain coral. Pretty cool.

Fossils in rock
Fossil coral in limestone. The vertical lines were made by machinery. (FL State Parks)

On the day we stopped at the park it was hot. We got there after the visitor’s center had closed early for some reason, but fortunately the hiking trail (and water fountain) was open. There are a few connected trails you can take- you can circumnavigate the quarry walls, and also make your way through the tropical hardwood hammock- for about a mile and a half of walking. There are a number of markers describing different plant species along the route- plants here are quite different from those around Orlando, so many of these species were new to us. The shade in the hammock was a welcome relief from the blazing sun.

Hardwood hammock
Hardwood hammock. Yay, shade! (FL State Parks)

Windley Key Park is a listed stop on the Great Florida Birding Trail, and the possible combination of White-crowned pigeons (a big dark pigeon with a white ‘scalp’) and fossils was just too interesting to pass up. I was really excited to see a few of the pigeons there- they’re pretty rare, and found in the US only in the Keys. Little did I know they would be flying overhead all the time in Key West… But they were a new species for me at this point. One of the main reasons they’re threatened in the Keys is that they need both mangrove forest and hardwood hammock (a drier type of forest) to eat and nest in- both of these types of forest are disappearing in Florida as development continues in coastal areas.

White-crowned pigeon
White-crowned pigeon (Great FL Birding Trail)

Other than the pigeons, we saw magnificent frigatebirds, mourning doves, northern mockingbirds, common grackles, a great crested flycatcher, and a mangrove cuckoo (also a first for me!). Given the heat of the day, it’s not a very impressive list, but seeing two new species, plus some cool fossils, was pretty nifty.

Categories
birds environment Hawaii outdoors

Hiking Waikamoi Preserve

'Alauahio (image from Maui Forest Bird Recovery Project)

One of the reasons we went to Maui on our recent trip back to Hawai’i was to look for endemic birds. There are three species in particular on Haleakalā that I really wanted to see, and hadn’t seen before: the Maui ‘Alauahio (or Maui Creeper), ‘Akohekohe (or Crested Honeycreeper), and Maui Parrotbill (recently given the Hawaiian name of Kiwikiu). All three species are endangered, the latter two critically (there are perhaps 3,800 ‘Akohekohe and 500 Parrotbills remaining). The Maui Forest Bird Recovery Project has a lot of info on these birds and their conservation.

'Akohekohe (image from USGS/Wikipedia)

While the ‘Alauhio is fairly easy to see within Haleakalā National Park (at the Hosmer Grove campground), the other two species have a more restricted range. The best way to see these birds is to go on a hike into the Nature Conservancy’s Waikamoi Preserve, which is located just downslope of the north side of the park. Three of us went on this hike: myself, my husband Yan, and my cousin David. Surprisingly, no one else had signed up for the hike- this one is only offered once a month.

Maui Parrotbill (image from Maui Forest Bird Recovery Project)

TNC offers guided hikes into the preserve in two locations: we opted to go on the Boardwalk hike, as we’d heard there was more of a chance of seeing ‘Akohekohe on this route (Parrotbills are much harder to find). The hike starts at about 6,800 ft, and descends about 1,000 feet. We’d been warned about cold and rain (it does descend into cloud forest), but the weather was pretty great. Given that the day after our hike a big storm system swept through and it poured all day in this area, we were pretty lucky.

After scrubbing our boots to remove any alien plant seeds, we climbed through the gate to the Preserve. While the forest is managed to keep feral goats and pigs out, we thought this warning sign at the entrance might be overstating the hunting frequency by a wee bit:

At upper elevations, the forest is a mix of alien species introduced to combat erosion caused by feral goats and cattle. These included various pines and redwood trees, which you can see in the background of this photo- what you see in the foreground are ‘Ohi’a lehua trees, one of the dominant native species in Hawaiian forests.:

Upper Waikamoi Preserve.

Throughout this area, you can hear the calls and whirring wings of the native honeycreepers: mainly ‘I’iwi, ‘Apapane, ‘Amakihi and ‘Alauahio at this elevation. It was definitely very cool! These birds are mostly restricted to high-elevation forest without mosquitoes, which carry avian malaria- a big reason they’re threatened. Some are nectar-feeders (the big poofy flowers of the ‘Ohi’a are a favorite) while others eat insects or seeds. It was interesting to see that they were able to use the alien parts of the forest for shelter, if not for food- I wasn’t expecting that.

Ohia lehua blossoms (image by P. Fukunaga, USGS)

Once we got into the relatively pristine cloud forest, we saw a huge diversity of native plants- sadly, my native plant ID skills have eroded and I couldn’t identify many of them. The trail here goes on a boardwalk path that’s effectively a very long set of stairs. The ground here was covered with moss and ferns- an indication of the high level of rainfall. The boardwalk keeps damage to the forest floor at a minimum and provides solid footing. It was pretty damp.

And, right as we got to the cloud forest, we saw four ‘Akohekohe! It was pretty cool- our guide, Michelle, was talking about the birds and the forest, and discussing how rare they were and how uncommon it was to see them. And then one-two-three-four: they landed on a tree behind her. Excellent timing.

At the bottom of the boardwalk, there’s a platform and a seating area. On the rare non-cloudy days, there’s probably a great view from here to the ocean. We hung out here for maybe an hour, looking for birds and just listening to the total absence of human noise. Birds, insects, the wind in the trees: that is all you hear in this spot.

David, going back up the stairs.

Then it came time to go back up the trail. We knew that the rain front was rolling in- it was getting mistier and rain was starting to fall. It didn’t get completely foggy until we got back up to the top, though. The weather was excellent, overall. We never did see any Parrotbills, but that was a very slim chance anyway. I think the ‘Akohekohe is probably the most endangered bird species I’ve seen. And we saw several of them, with their cute little feathery crests.

I’d been a bit worried about hiking at this elevation, after living at sea level for so long, but it wasn’t a problem. It probably helped that we’d been at the summit for a few hours beforehand, so the 5,000-ft drop to the trailhead made us breathe much easier.

Overall, we got to spend several hours immersed in the sights, sounds, and scents of one of the most unique forests on the planet. This was truly a wonderful experience, and definitely made the trip to Maui worth it all by itself.

Categories
birds environment science communication

Cooper’s hawk in library captured

The Cooper’s Hawk that’s been trapped inside the US Library of Congress reading room for the past week has been captured. She’s underweight, and will have to be rehabilitated before she’s released (presumably away from downtown Washington, DC).

The hawk strikes a dramatic pose (Library of Congress blog).

I find this account of the capture interesting. You can generally tell the sex of raptors apart, because of size (females are larger than males) and sometimes markings. You can also tell she’s a juvenile- adults have different markings:

Adult Cooper's Hawk (Peter Wallack, Wikipedia).

However, even though this hawk’s gender was known, reporters are having a really hard time referring to her as ‘her’- they seem to bounce between referring to her with female pronouns and gender-neutral pronouns.

I wonder what prompts this sort of confusion, in a case where the sex of a specific animal is definitely known. I know English a rare European language in which species aren’t ‘assigned’ a gender automatically (my German-speaking grandmother constantly refers to Noe as ‘he’ even though she knows she’s female!) I know the convention is to refer to animals as ‘it’- at least wild animals, that is. Maybe the author of this piece just can’t get past that convention? Then, of course, there are all the commentators that call the bird ‘he’- maybe because she’s a powerful bird of prey and therefore must be male?

This gets at one annoying issue in our cultural depictions of animals in popular media- for example, in movies like “A Bug’s Life” and “Barnyard“. Especially in animated films, the social behaviors in different species are rarely depicted correctly. This ranges from depicting animals as the normative nuclear family (e.g., “Aristocats“), to turning female animals male (as in “A Bug’s Life” and “Barnyard”). The case of “Barnyard” is particularly egregious- in that movie, the protagonist is a cow (complete with udders), but is voiced by a male actor.

Notice the offending organ is covered up in this DVD cover (Wikipedia).

Unless there is something seriously wrong with that poor bull’s genitalia, this is a really unfortunate mistake. How can you design a character whose salient bits are a hanging out for all to see, and then assign the wrong gender to it? (Okay, in this case udders are not genitalia, but you get my point.)

…Though I suppose I should give the hawk commenters the benefit of the doubt and concede that, indeed, birds do not have dangling penii to make immediate identification obvious.

Categories
birds environment Hawaii outdoors

Hiking to Kaena Point

The north-west tip of O’ahu is Ka’ena Point. This, the tip of the Wai’anae Mountains, is the one part of the island that’s not reachable by (paved) roads. There used to be both a dirt road and a railroad out here (the railroad for sugarcane transport). Now, the railroad has been removed and the road is extremely non-maintained.

You can actually drive along the non-maintained part of the road for a ways, from either side- fishermen do it. But with a rental car, you probably don’t want to risk it. This car, which apparently broke down at some point, has been out near the end of the road for a few years- every time we go back it’s just a bit more degraded. Last year, for example, the seats were still in decent shape.

Guess someone stripped it, then abandoned it...

A few miles toward the point from either side, the remaining road is fenced off. The reason is that this is one of the last non-developed coastal sites on O’ahu, because of its remoteness. It’s home to several species of threatened plant, and also serves as nesting ground for native seabirds: Laysan albatrosses and Wedge-tailed shearwaters, as well as a pupping spot for endangered Hawaiian Monk seals. The fence is intended to keep predators from slaughtering these ground-nesting birds.

A few dozen nest here each winter.

I think Laysan albatrosses are one of the more sophisticated-looking birds: isn’t that contrast between white head, slaty body, and subtly shaded eye mask cool?

Photo: Jlfutari at wikipedia.com

Back in the day, I did an internship with the Fish & Wildlife Service on Kaua’i. One of the things I got to do was help band Laysan albatrosses. These are the smallest albatross species, but still have a wingspan that’s up to two meters in length. More importantly for banding, those beaks are razor-sharp; we learned how to get around them pretty quickly! Despite their size, they don’t weigh much, and I strongly remember thinking that they smelled like feather pillows (unlike the Red-footed boobies, who would regurgitate half-digested fish onto you when approached- gross).

At any rate, Ka’ena Point is one of the last places on the main Hawaiian Islands where these beauties nest, at the end of the Wai’anaes.

Albatrosses nest on the ground; shearwaters dig burrows.

The day we went out, it was both hot (“Ka’ena” means “the hot”) and the surf was up. We didn’t see any Monk seals, but that just meant that we could go cool our heels in the tidepools.

All in all, this is a good hike on a winter day- there’s pretty much no shade, so it’s nice when it’s a bit cloudy. It can also be pretty breezy out at the point. While it’s generally quite dry, we’d just had rain and there were a lot of mud puddles on the road. It was pretty easy to get around them, though. Take water and a snack, and be prepared to just sit at the point for a while and watch the waves and the albatrosses coming in to land.

Categories
birds environment science communication

Flockalypse redux

Today, I’m revisiting my recent blog post on the “Flockalypse” to try to shed some light on what scientists mean when they say that large numbers of birds being killed “happens all the time.” I’ve seen this phrase in the news a lot lately, and I want to point out that it does not mean that scientists think that these types of deaths are “okay.”

Instead of taking “happens all the time” as a dismissal of the importance of mass bird die-offs, let’s look at as recognizing that many, many birds are killed every day from causes that are directly related to human activity. How many? Well, that’s hard to estimate, for a couple of reasons. One big reason is that many of these deaths occur at night, and night-roaming scavengers quickly dispose of the evidence.

Here’s one estimate of numbers. A 2005 paper by Wallace Erickson, Gregory Johnson, and David Young (“A Summary and Comparison of Bird Mortality from Anthropogenic Causes with an Emphasis on Collisions“) estimates that 500 million-1 billion birds are killed each year in the U.S. alone from human-related causes. This includes:

  • Collisions with buildings – 550 million (58.2%)
  • Collisions with power lines – 130 million (13.7%)
  • Cats – 100 million (10.6%)
  • Cars, trucks, etc. – 80 million (8.5%)
  • Pesticides – 67 million (7.1%)
  • Communication towers – 4.5 million (0.5%)
  • Wind turbines – 28.5 thousand (less than 0.01%)
  • Airplanes – 25 thousand (less than 0.01%)
  • Other sources (oil spills, fishing by-catch, etc) – did not estimate

While recent large mortality events have been in the news, the point I want to make is that a constant level of bird deaths occurs constantly due to human-related factors. These are large numbers. One in six bird species worldwide is threatened with extinction, because of the factors listed above plus things like habitat loss, invasive species, and climate change.

The endangered Florida Scrub-Jay (byVvAndromedavV, wikipedia.org)

Looking at this list, you should be able to see a number of ways that we can work to prevent at least some of these deaths. Things like making windows and other structures more visible to birds, keeping cats indoors, and minimizing use of pesticides are all crucial to the survival of many species. (For more info on some of these efforts, see the American Bird Conservancy’s site.)

So, can public attention to the recent dramatic bird deaths be used to spark wider awareness of what we can do to prevent the constant slow preventable deaths of birds? Hopefully, it can- and many science communicators are trying to get the word out. Human population growth and natural resource use, habitat loss and invasive species, along with global climate change, are ever-increasing threats to the survival of many species. We should try to prevent this constant rate of attrition whenever we can.