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Darker eggs feel the heat

Comparative analyses of egg colouration and experimental data suggest that variation in egg colours between species is shaped by thermoregulatory needs.

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Fig. 1: Average bird egg colours as predicted by the analyses in Wisocki et al. overlaid on the biome types of Whittaker’s classification which are a function of temperature and precipitation.


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Correspondence to Kaspar Delhey.

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The author declares no competing interests.

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Delhey, K. Darker eggs feel the heat. Nat Ecol Evol 4, 22–23 (2020).

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