<P> Many animals feed on eggs . For example, principal predators of the black oystercatcher's eggs include raccoons, skunks, mink, river and sea otters, gulls, crows and foxes . The stoat (Mustela erminea) and long - tailed weasel (M. frenata) steal ducks' eggs . Snakes of the genera Dasypeltis and Elachistodon specialize in eating eggs . </P> <P> Brood parasitism occurs in birds when one species lays its eggs in the nest of another . In some cases, the host's eggs are removed or eaten by the female, or expelled by her chick . Brood parasites include the cowbirds and many Old World cuckoos . </P> <Ul> <Li> <P> An average whooping crane egg is 102 mm (4.0 in) long and weighs 208 g (7.3 oz) </P> </Li> <Li> <P> Eurasian oystercatcher eggs camouflaged in the nest </P> </Li> <Li> <P> Egg of a senegal parrot, a bird that nests in tree holes, on a 1 cm (0.39 in) grid </P> </Li> <Li> <P> Eggs of ostrich, emu, kiwi and chicken </P> </Li> <Li> <P> Finch egg next to American dime </P> </Li> <Li> <P> Eggs of duck, goose, guineafowl and chicken </P> </Li> <Li> <P> Eggs of ostrich, cassowary, chicken, flamingo, pigeon and blackbird </P> </Li> <Li> <P> Egg of an emu </P> </Li> </Ul> <Li> <P> An average whooping crane egg is 102 mm (4.0 in) long and weighs 208 g (7.3 oz) </P> </Li>

Where does eggs come from in the world