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20 bird species can understand each other’s anti-cuckoo call
https://www.newscientist.com/article/2498809-20-bird-species-can-understand-each-others-anti-cuckoo-call/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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Several species of birds from different continents use and understand similar alarm calls when they see an invader that might lay an egg in their nest – this shared call hints at the origin of language