More than 20 species of bird around the world use a similar “whining” alarm call to warn birds like cuckoos are around. The call seems to be understood across species, and its specific use hints at ...
When a reed warbler in Zambia spots a cuckoo near its nest, it lets out a distinctive whining call. Halfway across the world in Australia, a fairy-wren does exactly the same thing. The two species ...
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