Nightlife: Ancient proto-mammals called Dimetrodons are shown in this illustration. Scientists now think these mammal ancestors were nocturnal rather than daytime creatures.
Much like all-night party animals of today, new findings reveal our earliest mammal ancestors also loved the nightlife.
A nocturnal existence is a way of life for numerous mammals, from bats that swoop through dark skies to skunks that emit their noxious spray under moonlight and majestic lions, tigers and leopards that prowl the night.
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