Troodon was a small, almost certainly feathered troodontid dinosaur that lived in North America. It, like dromaeosaurids, had a dangerous sickle-claw on its hind foot. However, despite this similarity, it is placed in a different class of maniraptorans, the troodontids. It was also similar to dromaeosaurs due to it having a big braincase, making it quite smart. It had large eyes, probably good for binocular vision and seeing at night.