Birds of different feathers flock together, eLife Science Digests

Different sized birds follow the same rules when flying in flocks, likely to save energy.

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File:Birds of a Feather Flock Together (Homer Davenport).jpg - Wikimedia Commons

Birds of a Feather Flock Together by David Lilly - The Canadian Nature Photographer

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Birds of a Feather Flock Together by David Lilly - The Canadian Nature Photographer

Birds of a feather flock together, but only in similar climates

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Feathers Together (Feeling Friends) by Caron Levis