When the body of a dead western scrub jay is seen by other jays, they summon others to the area using a specific call, according to new research from the University of California, Davis. The ‘funerals’ that the birds give can last for up to half an hour.
There has been previous evidence that other animals (such as elephants, chimpanzees, and birds in the crow family) mourn the dead of their species, said Teresa Iglesias, the UC Davis graduate student who carried out the work. But there haven’t been many experimental studies done to investigate behavior.
The new research was just published in the August 27 issue of the journal Animal Behaviour.
Interestingly, western scrub jays don’t live in groups, they only live in breeding pairs and are not very social with the other jays that they compete with. “They’re really territorial and not at all friendly with other scrub-jays,” Iglesias said.
“Working in the backyards of homes in Davis, Calif., Iglesias set up feeding tables to encourage visits from the jays. Then she videotaped their behavior when she placed a dead jay on the ground. She compared these reactions with the birds’ behavior when confronted with a dead jay that had been stuffed and mounted on a perch, a stuffed horned owl, and wood painted to represent jay feathers.”
“On encountering a dead jay, prostrate on the ground, jays flew into a tree and began a series of loud, screeching calls that attracted other jays. The summoned birds perched on trees and fences around the body and joined in the calling. These cacophonous gatherings could last from a few seconds to as long as 30 minutes.”
“While reactions of animals to their dead are sometimes called ‘funerals,’ that does not imply that there is an emotional or ritual element to the behavior, Iglesias said. We simply don’t know enough about the emotional life of animals to understand that.”
Not ruling it out, though, “I think there’s a huge possibility that there is much more to learn about the social and emotional lives of birds,” she said.
“Jays formed similar cacophonous gatherings in response to a mounted owl, but ignored painted wood. When confronted with a mounted jay, the birds swooped in on it as if it were an intruder.”
“Jays typically gathered within seconds of the first bird calling, Iglesias said. If they did not, the first jay would often fly higher into a tree, apparently to call more widely.”
“It looked like they were actively trying to attract attention,” she said.
“The purpose of the calls seems to be to alert other birds of danger, Iglesias said. But why the calls summon others, rather than warning them off, is unclear. Having more jays present might mean more eyes to locate a predator, or more numbers to drive it away, she speculates.”
“There might also be a learning component to the gatherings, if they help teach young jays about dangers in the environment,” Iglesias said.
Source: University of California – UC Davis
Image Credits: Teresa Iglesias, UC Davis photos