The Cambrian Explosion is a landmark moment in the history of life on Earth when many of the major groups of animals first appear in the fossil record. ...

A spiky worm with legs like noodles. A giant predator that looks like a cross between a walrus and a housefly. Many animals that evolved during the Cambrian period, 541 million to 485 million ...

Long before the first dinosaur hatched, Earth's ancient life was already thriving. There were bizarre sea creatures and lumbering plant-eaters that ruled prehistoric landscapes for hundreds of ...

The discovery of 480-million-year-old fossils in Morocco supports the likelihood that the Cambrian Explosion’s diverse life continued to evolve.

A new study says sea creatures follow a hypothesis called Cope's rule, which states that animal lineages will get heftier as time goes on. Published Thursday in Science, the study finds that the ...

Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion.

But pinning down the exact origin of these squishy sea creatures, which are some of the earliest complex animals, is difficult. They rarely show up in the fossil record because jellyfish are 95 ...

Scientists have unearthed extraordinarily preserved fossils of a 520-million-year-old sea creature, one of the earliest animal fossils ever found, according to a new study. The fossilized animal ...

Bizarre ancient sea creature brings evolution mystery to the surface A new tunicate fossil, a close relative of vertebrates, is half a billion years old.