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Which passeriform birds are the heaviest?
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Passeriform
Reed warbler (Acrocephalus scirpaceus).
The heaviest birds within the order Passeriformes are the lyrebirds of Australia and the ravens (Corvus).1
Specifically, the common raven (Corvus corax) and the thick-billed raven are recognized as the largest of the passerine birds. Common ravens are massive, typically weighing between 0.7 and 1.6 kg (1.5 to 3.5 pounds). While many passerines are small, ranging from 15 to 30 grams, these larger species represent the upper end of the size and weight spectrum for the order.21