Warm-blooded animals of the same species, living in different climates, have different metabolic rates. In birds, this variation is not only due to physiological adaptation — it is inherent in the animals' genes.
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Furness, R. It's in the genes. Nature 425, 779–780 (2003). https://doi.org/10.1038/425779a
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DOI: https://doi.org/10.1038/425779a