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Avian paternal care had dinosaur origin.
Varricchio DJ, Moore JR, Erickson GM, Norell MA, Jackson FD, Borkowski JJ. Varricchio DJ, et al. Among authors: jackson fd. Science. 2008 Dec 19;322(5909):1826-8. doi: 10.1126/science.1163245. Science. 2008. PMID: 19095938