H.D.A "(Notes) Humming Birds" Avicultural Magazine 1914
The Bee hummingbird can store very little energy in its diminutive, but comparatively heavy, vertebrate body. Females are slightly larger. It is thought that a bird any smaller could probably not eat enough to find the energy needed to feed. As it is, these tiny birds must feed almost constantly in order to maintain basic metabolism.
Note: This is the smallest bird in the world and is on the endangered species list.
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