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Canines, Felines, Cetaceans...

Mammals evolved from reptiles about 220 million years ago. After the extinction of dinosaurs around 65 million years ago, mammals diversified to fill the many vacated niches in a wide range of habitats. Mammals such as bats now patrol the skies, whales and dolphins inhabit the seas, and animals as diverse as otters and elephants fill habitats across the land.

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