Source: Pathfinder Bestiary, pg(s). 85
The Stegosaurus is a huge dinosaur, easily identified by the twin rows of sharp plates which run along its back. They gather in herds of up to a dozen creatures.
In combat, it defends itself with its tail. The tail ends in vicious spikes which can cause serious injury, and it can also be used to trip up the unwary.
A typical specimen is 30 feet long, stands 14 feet at the shoulder, and is 5,000 pounds in weight.
- Wikipedia:Stegosaurus (extinct real-world animal)