Birds' alarm calls to warn friends and foes

Washington, Dec 4 (ANI): A new UC Davis study has shown that birds' alarm calls serve both to alert other birds to danger and to warn off predators.

Jessica Yorzinski, a graduate student in animal behaviour at UC Davis who conducted the study with Gail Patricelli, professor of evolution and ecology, said that many animals respond vocally when they detect predators, but it's not clear to whom they are signalling.

They might be warning others of the threat, but they might also be telling the predator, "I've seen you."

To find out, Yorzinski used a ring of directional microphones around a birdcage to record the songs of dark-eyed juncos, yellow-rumped warblers, house finches and other birds as they were shown a stuffed owl.

All the birds were captured in the wild, tested, banded and released within 24 hours.

Overall, the birds' alarm calls were relatively omnidirectional, suggesting that they were given to warn other birds in the vicinity.

However, the main species tested-juncos, warblers and finches-all showed an ability to focus their calls in the direction of the owl, so these calls could also function to warn off a predator.

House finches were the least directional in their calls. They are also the most social of the species tested, Yorzinski said.

Some of the birds were able to project a call in one direction while their beak was pointed in another.

"It's like talking out of the corner of their mouths," Yorzinski said.

In some cases the birds may see better sideways than forwards, although Yorzinski did record evidence of birds projecting calls both forward and to either side.

"It's not clear how they're accomplishing this," Yorzinski said.

The study was published Nov. 18 in the journal Proceedings of the Royal Society B. (ANI)