Reed warblers live with the threat that a cuckoo bird will infiltrate their nest, remove one of their eggs, and replace it with the cuckoo's own. This 'parasitism' enables the cuckoo to have its young ...

Reed warblers use mobbing as a front line of nest defense against parasitic cuckoos, according to a new report published online on January 29th in Current Biology, a Cell Press publication. Cuckoos ...

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Old-World warblers, some 350 of them, seem to like wearing the same uniform – dusky olive brown, beige and grey -- which makes them a pain to identify ...