A red-fronted brown lemur climbs on a tree at night


Nocturnal animals are primarily active at night rather than during daylight hours. There are all sorts of reasons why this behaviour might be a good idea. In hotter places such as the tropics, it's cooler at night. If you're a bat, then your ancestors took to the night skies to avoid competition for resources from birds. And, of course, it's easier to hide from predators under cover of darkness.

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BBC News about Nocturnal

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