Thunder Lizard

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Almost everybody's favorite dinosaur is Apatosaurus, which means "deceptive lizard". Its better-known (but incorrect) name is Brontosaurus, the "Thunder Lizard".
Apatosaurus was one of the largest and most commmon sauropod dinosaurs (in what is now the western United States) of the Jurassic period.

Genus Name: Apatosaurus ("deceptive lizard")
Type Species: * A. ajax (Marsh, 1877)
Length: 69-85 feet (21-26 meters)
Weight: 10-40 tons
Time: 155-145 million years ago (Late Jurassic)
Place: Colorado, Oklahoma, Utah, Wyoming
Diet: plant-eater (herbivore)