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Brood parasitism has even been seen in higher roadrunners, wherever their eggs were noticed within the nests of typical ravens and northern mockingbirds. The shells on the eggs of brood-parasitic cuckoos are frequently thicker and much better than These of their hosts.[twenty five] This safeguards the egg if a host parent attempts to damage it, and should allow it to be proof against cracking when dropped right into a host nest.[26] Cuckoo eggshells have two unique levels. In a few nesti