Mass Animal Deaths: An Environmental Whodunit

When 5,000 red-winged blackbirds fell dead on New Year’s Eve in Arkansas, and 500 more in Louisiana, many people immediately looked for a villain. There was speculation about military tests and pesticides, and a lot of wondering whether the bird deaths and other incidents, including the mass deaths of fish, were linked. Melanie Driscoll, a biologist and director of bird conservation for the Gulf of Mexico and Mississippi Flyway for the National Audubon Society, said preliminary tests showed no evidence of viral or bacterial disease, toxins or poisons, but there were reasonable explanations. “In Arkansas, we have eyewitness accounts that professional-grade fireworks were set off in a town near a known blackbird roost,” she said, “and that birds flushed from the roost and flew in a single direction at lower levels than they would normally fly. We know that they cannot see well in the dark and we know they were seen crashing into buildings and cars and poles. Necropsies show blunt force trauma to brain and breast.” As for the hundreds of red-winged blackbirds found dead in Pointe Coupee Parish, La., a few hundred miles from the Arkansas die-off site, they were found along rural roads under power lines, which are thin and difficult to see at night. The theory is that those birds were also spooked by holiday fireworks, and ran into the lines...more