Wednesday, May 24, 2017

The Secret Life of Urban Crows

On a blustery overcast morning this past April, Kaeli Swift walked across the campus of the University of Washington toting a weathered, purple-and-white plastic shopping bag. This bag, if found by some unsuspecting student or grounds person, would almost certainly trigger a campuswide panic. Inside Swift had stowed a rubber mask of a grotesque, exaggerated male face—large ears, bulbous nose, silver-whiskered soul patch—a guise that would not look out of place in a 1980s horror film. Also inside: a corpse. That the corpse was only that of a bird hardly made the tattered bag’s combined payload any less creepy.

She tromped through the wet grass in calf-high Sorel snow boots and made her way to the university’s Center for Urban Horticulture, where she’s a teaching assistant for an undergraduate natural history class. Near the Dumpsters and trash cans parked behind the center, Swift found a perfect spot for what she was about to do: perform a ritual that, depending how you look at it, is a couple of years old or a couple million.

Swift, a PhD candidate, is a member of UW’s nationally acclaimed Avian Conservation Lab. If you’ve heard or read a news story in the last decade about Corvus brachyrhynchos—aka, the American crow—and what science has to say about its confounding habits and aptitude, there’s a good chance it was thanks to the work conducted by the lab, led by a man named John Marzluff. The UW professor and wildlife biologist is the author of numerous popular books on the subject. In 2008, Marzluff and his fellow researchers made national headlines when they tested a hypothesis—that crows recognize individual human faces—by donning Dick Cheney masks. That led to another revelation: Crows teach other crows to detest specific people (and sometimes attack them).

Today Swift, 30, would repeat an experiment that uncovered one of the team’s more staggering revelations. And she conducted it with the ceremony of an undertaker.

From the old shopping bag she unsheathed the dead crow and turned it in what little sunshine strained through the fibrous clouds. The black feathers sparkled in the light, and close inspection revealed iridescent blues and purples. She covered it back up with a tan cloth and, with the draped bird lying breast down on her two upturned palms, stepped gingerly onto a patch of grass. She tore the linen away and unveiled the corpse to the gray heavens.

There was nothing at first, just an empty sky. Then, a caw. A crow appeared on a nearby power line. Then another caw and another crow. Suddenly crows flew in from all directions. Their plaintive entreaties soon combined into a chorus. New arrivals joined what quickly grew into a cacophonous dervish of black silhouettes swirling directly above Swift.

It was like sorcery. Conjuring dozens of birds from thin air by simply removing fabric from a body.

This, according to Swift, is what its like to attend a crow funeral—an instinctive ritual that evolved generations ago and was just discovered by humans; Swift coauthored an article on her findings in the journal Animal Behaviour in 2015. The gist: Upon spotting one of its dead, the flock attends to the fallen bird en masse with loud shrieking. Given enough time the throng will mob any predator it thinks is responsible, like say, a human in a Dick Cheney mask, or in a mask like the one Swift had in her bag (the lab affectionately refers to that be-soul-patched fellow as Joe).

Because she had decided to leave Joe out of today’s repeat of her groundbreaking experiment, she had to take precautions. Early during this gathering tsunami of sound, once the crows became particularly agitated, Swift pulled the hood of her rain jacket over her face, lest the birds, days later, recognize that face—elfin features, sometimes sharpened with rectangular-framed eyeglasses, and bracketed by a cascade of brown curls.

It’s no accident that Swift and the Avian Conservation Lab are based here. Seattle is unique among U.S. cities for what its human citizens have unwittingly fashioned over the past century or so, a habitat ideal for these ebon-winged aviators. It’s also a city obsessed. Crows figure into local iconography, they occupy our art, and, last year, they were at the center of a $200,000 lawsuit.

For now, up above, the birds Kaeli Swift had stirred into a squawking horde were just getting started. She gave one more tug on her jacket hood, pulling it down tight. It was going to be a wild ride.

by James Ross Gardner, Seattle Met | Read more:
Image: Mike Kane