Prehistoric animals once roamed — and ruled — planet Earth. Some of them ... The giant crocs mostly ate sea turtles and shellfish, but sometimes tangled with T. Rex cousins like ...

Fossils are physical evidence of prehistoric animals and plants. They tell us about the history of our planet, from climate and evolution ... mud or the calcium carbonate shells of sea creatures ...

The animals constantly grew new shell material ... The many chambers of their shells likely helped these cephalopods glide through the planet’s warm, shallow seas. A thin, tubelike structure ...