"Nasal Horned Horn Lizard"
Length: 6.7m (22ft)
Weight: 980kg (2200 lbs)
Location: Colorado, USA
Era: Tithonian age, upper Jurassic (148 million years ago)
The first large theropod known from a reasonably complete skeleton. Though the notable horns adorning its skull are now thought to be purely ornamental, Marsh originally described them as "a most fearsome weapon."