Scrub jays react to their dead

Sep 11, 2012
Clockwise from top left: A painted object; a dead jay; a stuffed, perched jay; and a stuffed owl predator are used to test jays' reactions to different objects. (Teresa Iglesias, UC Davis photos)

Western scrub jays summon others to screech over the body of a dead jay, according to new research from the University of California, Davis. The birds' cacophonous "funerals" can last for up to half an hour.

Anecdotal reports have suggested that other animals, including , and in the crow family, react to dead of their species, said Teresa Iglesias, the UC Davis graduate student who carried out the work. But few experimental studies have explored this behavior.

The new research by Iglesias and her colleagues appears in the Aug. 27 issue of the journal .

Western scrub jays live in breeding pairs and are not particularly social birds.

"They're really territorial and not at all friendly with other scrub-jays," Iglesias said.

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Videography by Teresa Iglesias/UC Davis video

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 .

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.

Jays formed similar cacophonous gatherings in response to a mounted , but ignored painted wood. When confronted with a mounted jay, the birds swooped in on it as if it were an .

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 , if they help teach young jays about dangers in the environment, Iglesias said.

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.

But Iglesias isn't ruling it out. "I think there's a huge possibility that there is much more to learn about the social and emotional lives of birds," she said.

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TopherTO
not rated yet Sep 11, 2012
Be curious to see their reaction to the remains of a bird that was not a scrub jay instead of the blue wood planks. Do they pair bond or are a part of a social order?

My initial reaction is it's more likely evolutionary response to an external threat than some sort of mourning.
ubavontuba
not rated yet Sep 12, 2012
These boisterous birds (and their corvid cousins) are amazingly intelligent. It seems their ability to analyze a situation for threat vs. reward is superior to other birds.

But as they didn't perceive the stuffed bird to be dead, this looks more like a warning, than a mourning. I suspect the additional eyes are called in to try and identify the source of the danger.

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