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Paleontologists believe that the first mammals to evolve on Earth were small nocturnal creatures that used a keen sense of smell and hearing to operate in the dark, which was a good place to be in the age of the dinosaurs. These days, many mammal species spend most of their time operating during the daytime, and many other species are crepuscular, which means they do most of their hunting, mating and interacting in the early morning and twilight hours.
But when did mammals make the switch from the night life to day life? Now, reports Gretchen Vogel at Science, a new study pinpoints the time in the distant past when mammals came out of the dark. And it turns out, it’s immediately after the demise of the dinosaurs.
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