..."Cuckoos have evolved various strategies for getting their egg into a host nest. Different species use different strategies based on host defensive strategies. Female cuckoos have evolved secretive and fast laying behaviors, but in some cases, males have been shown to lure host adults away from their nests so that the female can lay her egg in the nest[17] . Some species of cuckoo Host species may try directly preventing cuckoos laying eggs in their nest in the first place – birds whose nests are at high risk of cuckoo-contamination are known to mob cuckoos to drive them out of the area"...
http://en.wikipedia.org/wiki/Cuckoohttp://www.youtube.com/watch?v=ZueSvMsUHV8&feature=player_embedded
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