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The following 2 entries include the term allen's.
Allen's hummingbird
noun: a hummingbird (Selasphorus sasin) of western North America, the male being metallic green above with bright red throat and whitish breast, the female being variably marked with reddish brown, gray, and white
Allen's rule
noun: a statement in zoology: protruding body parts (as ears, tail, legs, bill) of warm-blooded animals are relatively shorter in cooler than in warmer parts of the range
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Merriam-Webster unabridged
