Marsh Warbler (Acrocephalus palustris) nest parasitized by the cuckoo (Cuculus canorus) Marsh Warbler (Acrocephalus palustris) photo
Marsh Warbler nest parasitized by the cuckoo (Cuculus canorus)
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The cuckoo egg is at the top; despite excellent similarity to host own eggs the cuckoo egg was later ejected by nest owners

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Clever nest owners.

This parent was not so lucky to differentiate and ended up like this... http://ibc.lynxeds.com/photo/shiny-cowbird-molothrus-bonariensis/juvenil...


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