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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Hughes, E.C., Slavenko, A. Smaller birds with warmer temperatures. Nat Ecol Evol 6, 1804–1805 (2022). https://doi.org/10.1038/s41559-022-01897-7
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DOI: https://doi.org/10.1038/s41559-022-01897-7
