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Brood parasitism has even been viewed in greater roadrunners, in which their eggs were being found while in the nests of typical ravens and northern mockingbirds. The shells of your eggs of brood-parasitic cuckoos usually are thicker and more powerful than People of their hosts.[twenty five] This shields the egg if a bunch mum or dad tries to break it, and could enable it to be proof against cracking when dropped into a host nest.[26] Cuckoo eggshells have two distinct levels. In a few nesting cuckoos, a thick, o
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