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Climate change

Smaller birds with warmer temperatures

Measurements of individual birds of 105 species across North America over almost twenty years reveal intraspecific trends of smaller body sizes towards the equator and of decreasing body size as average temperatures increase.

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Fig. 1: Checking the moult and working out the age of a gray catbird (Dumetella carolinensis).

United States National Park Service, public domain.


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Correspondence to Emma C. Hughes or Alex Slavenko.

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Hughes, E.C., Slavenko, A. Smaller birds with warmer temperatures. Nat Ecol Evol 6, 1804–1805 (2022).

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