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The limbs of the earliest four-legged vertebrates from 360 million years ago were not as structurally diverse as previously thought.

One study suggests that the uneventful decline of crocodyliforms coincided with the diversification of modern marine turtles.

Around 56 million years ago, several groups of primitive primates mysteriously disappeared from the North American forests. Rodents have been considered a major cause of their extinction due to competition for food, but a new study says that’s unlikely.