Prehistoric
Age of Mammals
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Age of Mammals
By the time the dinosaurs became extinct, several different groups of mammals had already evolved around the world. The first mammals evolved during the Late Triassic Period. They...
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First mammals
Mammals are descended from mammal-like reptiles, called pelycosaurs, that lived on Earth about 300 million years ago. The first warm-blooded animals—being warm-blooded is a basic...
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Evolution of mammals
New kinds of mammal evolved to eat different types of food—plants, insects, other animals and so on—in different habitats all over the world. But over the 210 million years...
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Evolution of elephants
The two species of elephant alive today—the African and Asian—are all that remain of a once large and magnificent family of animals. An early elephant was Moeritherium, a...
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Evolution of marine mammals
Three mammal groups are water-dwelling animals: the cetaceans (whales, dolphins and porpoises), the sirenians (manatees and dugongs) and the pinnipeds (seals, sea lions and...
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Ice Ages
Ice ages have occurred frequently throughout the Earth’s history. They are times when the climate cools down so much that ice caps form at the poles and spread out. The most...
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Mammoths
Mammoths are extinct kinds of elephant, known for their long, curved tusks and, in later species, their shaggy coats. The most familiar species, the woolly mammoth, lived in...
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Age of Mammals A-Z