Sea lampreys migrate from oceans to rivers and lakes to mate, feeding on the blood of fish such as lake sturgeon and salmon. Emperor scorpions, among the largest scorpions at nearly eight inches ...

The giant sea scorpion was an enormous predatory aquatic ... 16 feet and featured an insanely-big mouth and blunt teeth. This prehistoric creature was a stem-group arthropod from the early ...

Two underwater sea lilies were eaten and regurgitated around 66 million years ago. They were preserved as fossilized vomit.

Previous reef-builders such as bryozoans were joined by corals and prehistoric sponges known ... food chain were the fearsome eurypterids, or sea scorpions. Some species grew to more than six ...