The name Apatosaurus means "deceptive lizard," and I can't think of a more fitting moniker for a dinosaur with such a complicated history.

For the longest time, nobody knew what the head of Apatosaurus looked like. Paleontologists debated over whether it should look more like a Diplodocus or a Camarasaurus until its real skull was confirmed in 1978. Now that's turning heads!

When the man who discovered Apatosaurus in 1877 shipped fossils to both Othniel Charles Marsh and Edward Drinker Cope... ... he inadvertently caused a chain reaction leading to one of the craziest, most heated eras in fossil collecting history, the Bone Wars.