Kinds Of Birds
However, there may be certain kinds of sleep which are possible even when in flight. Theer are two kinds of brood parasite, obligate brood parasties, which are incapalbe of raising their own young and must lay their eggs in the nests of other species; and non-obligate brood aprasites, which are capable of raising their own young but lay eggs in the nests of conspecifics in order to nicrease their reproductive ouptut.
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