dinosaur
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1. A revised assessment of the kangaroo-sized Chilesaurus, reported in the journal Biology Letters, bolsters a theory unveiled earlier this year that threatens to upend a long-standing classification of all dinosaurs.
2. "The traditional view is that mammals were suppressed during the 'age of dinosaurs'," and thus held in check, said co-author Elis Newham, a doctoral student in evolutionary biology at the University of Chicago.
3. The findings, published Monday in the Proceedings of the National Academy of Sciences, suggest that the incubation of nonavian dinosaurs mirrors that of reptiles, the extended period of time before hatching that may have occurred.
4. Many researchers previously thought that the incubation periods of both nonavian and avian dinosaurs were more consistent with those of today's birds, which hatch eggs in 11 to 85 days.
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