Previous reef-builders such as bryozoans were joined by corals and prehistoric sponges known as stromatoporoids, which formed a hard outer skeleton ... out primitive fish, which they grabbed ...

Pterosaurs lived around the globe, researchers said, but finding skeletons is incredibly rare ... which helped during feeding ...

Placoderms are a class of prehistoric armoured fish that first appeared during ... They had internal cartilaginous skeletons like sharks and rays but with an armour-like external skeleton made ...