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Sea scorpions thrived for 200 million years, coming in a wide variety of shapes and sizes.
Ancestors of cephalopods all had shells until it proved to be their biggest weakness.
Why the Triassic was full of creatures that look a lot like other, more modern species.
Before a group of fish could live on dry land, they acquired the ability to breathe air.
Insects were the first animals to fly. Scientists are still working on how it happened.
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
Horses vanished from North America for 10,000 years until a mammal brought them back.
