Analysis of 10,000 Bird Species Reveals How Wings Adapted to Their Environment and Behavior (IMAGE)
Caption
Poecile montanus: Dispersal ability has a prominent latitudinal gradient; species that live in temperate regions, like this Willow Tit, can on average fly farther than those that live in the tropics
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Photo in the public domain: https://commons.wikimedia.org/wiki/File:Poecile_Montanus_Kittila_20120306.JPG
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