Stegosaurus
Stegosaurus stenops
“Roof Lizard”
Stegosaurus, meaning 'roof lizard', is instantly recognizable by the row of large, diamond-shaped plates along its back and the four sharp spikes on its tail (called a thagomizer). Scientists debate whether the plates were for defense, temperature regulation, or display. Its brain was famously small - about the size of a walnut.
Quick Facts
Time Period
Late Jurassic (155-150 million years ago)
Diet
herbivore
Length
30 feet (9 meters)
Weight
5 tons (4,500 kg)
Location
North America
Fun Fact
Despite its huge body, Stegosaurus had a brain the size of a walnut!
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