Late Triassic-early Jurassic, 206-180 million years ago
Though it lived at the same time, Ichthyosaurus was not a dinosaur. And though it looks a bit like a modern dolphin, it wasn’t a mammal (or even a fish!). Ichthyosaurus was a reptile, and it lends its name to an entire group of similar marine reptiles: the ichthyosaurs (“fish lizards”). Ichthyosaurs mostly ate fish, and probably hunted near the water’s surface using their large eyes. And, based on juvenile fossils found inside adults, they gave birth to live young, just like your mother. Ohhhhhhh.