Have shell, will travel

Fossilized tracks left by early land-dwelling animals reveal they brought shells ashore

By Stephen Ornes, 00:00 AM April 24, 2009

A creature much like a modern hermit crab likely made these tracks 500 million years ago.

A creature much like a modern hermit crab likely made these tracks 500 million years ago.

W. Hagadorn

Many modern animals, like crabs, live in shells and carry their homes around with them. Picture one of these animals in your mind, and you may have some idea of what the first land-dwelling animals looked like. After studying strange marks that accompany some sets of ancient fossil footprints, scientists recently suggested that the oldest creatures to crawl out of the ocean probably wore ...

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