Footprints point to earliest four-footed anim

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The world's first four-limbed animals, called tetrapods, crawled on land much earlier than scientists thought, judging by tracks left behind by some of the animals in a prehistoric Polish lagoon.

The fossilized footprints from these animals are 18 million years older than the earliest tetrapod body fossils, pushing the emergence of four-limbed creatures back to at least the early Middle Devonian period, according to two papers published in the latest issue of the journal Nature.

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