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Jurassic Period

On the left is a parent of the early mammal Dryolestes which raises a brood after reaching sexual maturity at age four. On the right is a Haldanodon, a member of the family of mammal-like docodonts, before fully reaching the mammalian evolutionary level; the creature's lifespan was eleven to fourteen years.

Early mammals lived longer

Bite and tooth marks on sauropod dinosaurs from the Morrison Formation

Surprising insights into feeding habits of carnivorous dinosaurs in North America

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