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Mammals
Mammals are the only animals whose females produce milk to feed their young.
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Dinosaurs
Dinosaurs roamed the earth up until 65 million years ago.
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Reptiles
Reptiles are present on every continent except Antarctica.
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Fish
Fish came into existence long before dinosaurs roamed the earth.
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Invertebrates
Invertebrate species live in almost every habitat on the planet in what can sometimes be astonishing numbers.