Bird alarm: Great tits use 'predator-specific' calls

Great tits use different alarm calls for different predators, according to a scientist in Japan. The researcher analysed the birds' calls and found they made "jar" sounds for snakes and "chicka" sounds for crows and martens. via Pocket http://www.bbc.co.uk/news/science-environment-25016160#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa