Lived: 150 - 155 million years ago in the late Jurassic period.
Size (average): 9.7 meters long and 2.3 metric tons.
The main predator in the late Jurassic period, the allosaurus’ teeth are large and serrated. So try not to get bit by this guy! The allosaurus also has light bones, which would explain how it can support its ginormous head that is packed full of teeth. The natural enemy of the allosaurus is gravity — if this fellow takes a spill, he’s not getting back up with tiny arms like that.