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What percentage of the world’s bird species are passeriforms?
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Passeriform
Reed warbler (Acrocephalus scirpaceus).
Passeriforms, which are members of the order Passeriformes, make up 60 percent of all bird species in the world.1
Often referred to as true perching birds, they are the most dominant avian group on Earth today. Their evolutionary success is attributed to factors such as large brain size, behavioral plasticity, and complex nest-building capabilities, which have allowed them to adapt to a wide variety of terrestrial environments.21