Effigia okeeffeae

Effigia looks just like a dinosaur. It particularly looks a lot like bird-like dinosaurs called ornithomimids, or ostrich dinosaurs. Like the ornithomimids, Effigia had large eyes, a beak, a long tail, and no teeth—and walked on two feet. But this creature lived about 80 million years before ornithomimids appeared on Earth. In fact, it isn't even a dinosaur at all. It's an ancient relative of the crocodiles.

Image credits: main image, Sean Murtha; Sterling Nesbitt: courtesy of AMNH.