Plesiosaurs 101 | National Geographic
(water splashes) (ominous music) – [Narrator] Sea monsters are considered to be mythical creatures at the center of tall tales. (lighting crackling) But science tells a story of real-life monsters lurking in Earth’s prehistoric seas, monsters called plesiosaurs. Plesiosaurs were ancient marine reptiles that first appeared about 215 million years ago. They belonged in the… Read More »