Ornithopods

All the ornithopod dinosaurs were herbivores with horned beaks. Their jaws and leaf-shaped cheek teeth were ideal for chewing vegetation. They were bipedal, although some of them may have foraged for food on all fours. Their feet had three or four toes with hooflike claws, and their hands had four or five fingers. Group living

Hypsilophodon may have moved in herds for protection against predatory theropods. Moving as a large group, they would have been able to warn each other of any danger, giving them a better chance of survival.

Tusklike teeth

Cheek, teeth

Tusklike teeth

Heterodontosaurus

Toothy skull

Heterodontosaurus had three different kinds of teeth. These were the front upper teeth, which bit against the toothless lower beak; the scissorlike cheek teeth; and a pair of upper and lower tusklike teeth.

Group members looked from side to side for any danger.

Group members looked from side to side for any danger.

Paleolithic Anatomy

Bony tendons

Paleolithic Anatomy

Vertebrae support Ornithopods such as Iguanodon had a crisscross of bony tendons strengthening the vertebrae above the hip and in the back. These bony tendons also stiffened the tail. This helped Iguanodon balance as it walked on its two back legs.

Toes ended in flattened hooves

Ornithopod facts

• The name ornithopod means "bird foot."

• They ranged in length from 6M ft (2 m) to 49 ft (15 m).

• Some ornithopods had up to 1,000 cheek teeth.

• They could run at speeds of at least 15 mph (9 km/h).

Three-toed feet The powerful three-toed feet of Corythosaurus were built to carry its heavy weight. Corythosaurus weighed approximately 4 tons (tonnes) and was about 24 ft (7.5 m) long. It belonged to a group of ornithopods called hadrosaurs.

Bony tendons

Hypsilophodon

F was about 7l/2 ft

Toes ended in flattened hooves

Dinosaurs Anatomy

Hypsilophodon

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