News Animals Why Crows Hold Funerals for Their Dead Scientists don masks to find out if crows are holding vigil or something else entirely. By Jaymi Heimbuch Jaymi Heimbuch Twitter Writer California Polytechnic State University, San Luis Obispo Jaymi Heimbuch is a writer and photographer specializing in wildlife conservation, technology, and food. She is the author of "The Ethiopian Wolf: Hope at the Edge of Extinction." Learn about our editorial process Updated October 29, 2020 This story is part of Treehugger's news archive. Learn more about our news archiving process or read our latest news. Share Twitter Pinterest Email Crows are known to gather together around other dead crows but the behavior was a mystery, until now. . John C Evans/Shutterstock News Environment Business & Policy Science Animals Home & Design Current Events Treehugger Voices News Archive There's an unusual but known behavior among crows, that they gather around the bodies of their dead. A crow dead on the street or in a field will be surrounded by a few to a dozen or more crows, all seeming to contemplate their fallen comrade. The notion of crow funerals has been documented but not necessarily understood, so a few years ago, University of Washington biologists Kaeli Swift and John Marzluff decided to create experiments to find out what exactly is happening. If you've ever read about experiments with crow behavior, you'll know the experiments often involve researchers wearing masks, as you can see in the video below. Crows learn to recognize individual faces and teach their offspring who (or what) to be concerned about. And because crows have a long memory, a researcher could be disliked by local crows for decades. To avoid a long-running feud, the Washington research volunteers donned masks. They also wore signs that explained that the exercise was all part of a crow study. The New York Times reports: "It begins with a woman named Kaeli N. Swift sprinkling peanuts and cheese puffs on the ground. Crows swoop in to feed on the snacks. While Swift observes the birds from a distance, notebook in hand, another person walks up to the birds, wearing a latex mask and a sign that reads “UW CROW STUDY.” In the accomplice’s hands is a taxidermied crow, presented like a tray of hors d’oeuvres." How The Crows React Swift watches what happens when a volunteer approaches the crows. When someone is carrying the crow, the person is mobbed almost every time. The crows will continue to scold that figure for as long as six weeks later, even if the person is empty-handed. The crows also take a longer time to approach the food source again after seeing a person with a dead crow in that area. On the other hand, if a masked volunteer is carrying a taxidermied pigeon, the figure will be mobbed only about 40 percent of the time by the crows, and the crows won't really hesitate to return to the food source after the person leaves. The conclusion? The sight of a dead crow leaves a lasting impression on living crows. Swift and Marzluff suggest that the reason crows pay such close attention is that it's a learning opportunity for survival, a chance to know which individual humans, animals, or situations are dangerous. Gathering together may be a way to share this information with the group, protecting the remaining members of the flock. It's clear crows know how to recognize a friend versus an enemy. In one famous recent example, crows began bringing gifts to a little girl who regularly fed them, whereas they continue to scold people they recognize have done them harm and teach other crows to scold the same individuals. What has been called "crow funerals" may be more aptly considered crow study sessions, where they learn lessons about what caused a fellow crow harm so they can avoid a similar fate. The research is particularly compelling because only a small handful of species are known to pay attention to their dead. “It’s pretty consistently animals that live in social groups and are known for having more advanced cognitive skills,” Swift told the New York Times. “It’s amazing to think a crow — a bird — is doing something like this that so few other animals are doing that we know.” The study was published in Animal Behaviour.