Ancestors of giant Bobbit worms may have colonized the seafloor millions of years ago, building long, narrow burrows where they would wait for unsuspecting prey.
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An ancient fossil has been identified as the ancestor of all starfish-like animals living on the planet today, according to a new study.
Scientists describe a new species of assassin bug from a fossil that dates to around 50 million years ago and includes the insect's intact genitals.
Fat molecules attributed to ancient sea sponges actually belonged to algae, two new studies suggest.
A Tyrannosaurus rex called Stan ended up on the auction block because of a lawsuit. Here's how it happened.
These strange, long-necked Triassic beasts were able to coexist because they chowed down on different prey.
A squid-like creature was hunting for a meal about 200 million years ago, but it never got to gulp down its supper.
This 380-million-year-old fish had five "fingers" in its pectoral fins, showing that fish developed fingers before making the move to land.