Plesiosaurs are a group of extinct marine reptiles that lived in the oceans while the dinosaurs lived on land. Find out what plesiosaur fossils have revealed about these animals and how big they could ...
Bone worms (the red animals in this picture) were first discovered in the early 2000s, but these animals are believed to have evolved more than 100 million years ago. Adapted from Fujiwara et al. via ...
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