Scientists have shown that many birds affected by the parasitic Common Cuckoo — which lays its lethal offspring in other birds' nestshave evolved distinctive patterns on their eggs in order to distinguish them from those laid by a cuckoo cheat.

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Image: Mary Caswell Stoddard/Natural History Museum

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DISCUSSION

kaymariev
Kay Mariev

It's kind of hilarious when you see the little songbird feeding the cuckoo chick that's like 3 times its size.

Get with it bird! That is not your baby!