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Early birds may have been too hefty to sit on their eggs
Birds that lived at the time of the dinosaurs might have been too heavy to sit on clutches of eggs without breaking them, according to an analysis of primitive avian fossils. The findings suggest that incubation might be a defining feature of modern birds, evolving only in the past 100 million years.
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doi: https://doi.org/10.1038/d41586-018-03447-3
References
Deeming, D.C. & Mayr, G.J. Evol. Biol. http://dx.doi.org/10.1111/jeb.13256 (2018).
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