How birds spot the cuckoo in the nest

It's not always easy spotting the cuckoo in the nest. But if you don't, you pay a high price raising someone else's chick. How hosts distinguish impostor eggs from their own has long puzzled scientists.

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<p><a href="http://www.physorg.com/news135329815.html">How birds spot the cuckoo in the nest</a></p> <p>It's not always easy spotting the cuckoo in the nest. But if you don't, you pay a high price raising someone else's chick. How hosts distinguish impostor eggs from their own has long puzzled scientists.</p>