If you enjoy sleeping at night instead of the day, thank the dinosaurs for going extinct
by Amina Khan, Los Angeles Times
Nov 07, 2017
2 minutes
Mammals were largely creatures of the night until the dinosaurs were killed off by an asteroid some 66 million years ago, a new study finds.
The findings, described in the journal Nature Ecology & Evolution, illuminate a pivotal transition in the history of Earth's living things.
Scientists have long wondered whether ancient mammals may have been primarily nocturnal because
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