It was the largest predator to actively search out ... They may look otherworldly to us, but the Cambrian animals set the stage for all animal life on Earth, including us. Watch First Animals ...

The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones ...

All animal evolution for the last half billion years has come from tinkering with these Cambrian body plans. Then, between about 570 and 530 million years ago, another burst of diversification ...

The archaic sponge reef-dwellers of the Cambrian gave way ... This resulted in the second largest mass extinction of all time, wiping out at least half of all marine animal species about 443 ...