This dinosaur was likely resting in a burrow before it was abruptly buried alive.
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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.
A billion years ago, this green seaweed likely produced oxygen and provided shelter for other organisms.
Fossils discovered in Nevada contain preserved guts from a mysterious creature that lived 550 million years ago.
New evidence of preserved brain tissue from the Cambrian period counters arguments that nervous tissue cannot be fossilized.
Scientists reveal more mysteries about the bizarre Tully Monster, an ancient sea creature with stalked eyes that has defied classification.
Trilobites fossilized in Morocco seem to have been buried by a storm as they marched in an orderly queue.
An ancient relative of spiders and scorpions had a tank-like body with bulging eyes, a spiky shield on its butt and a head like a multitool.
The face of the oldest known species of Australopithecus looks a bit like the famous "Lucy" and a bit like far older hominins.