Sauropods

The largest-ever land animals were included in the sauropod group. Sauropods were quadrupedal, plant-eating saurischian dinosaurs. They all had huge bodies with long necks and elephant-like legs. They also had long tails which they used as whiplike weapons against enemies.

Peglike teeth

Back of jaws was toothless

Peglike teeth

Back of jaws was toothless

Tail reinforcement Tail bones like the one above were on the underside of Diplodocus' tail. They reinforced and protected the tail when it was pressed against the ground.

Front teeth

Diplodocus had a long skull with peglike teeth at the front of the jaws. The teeth would have raked in plants such as cycads, ginkgoes, and conifers. Diplodocus had no back teeth for chewing, so the food was probably ground in the stomach by gastroliths (stomach stones).

Apatasaurus

This sauropod was once known as Brontosaurus. At 73 ft (23 m) long and weighing 27 tons (tonnes), it was one of the largest sauropods. It had a long, horselike head with a fist-sized brain, and powerful legs with padded feet.

Tail weapon

Barosaurus resembled Diplodocus, but had a slightly longer neck and a shorter tail. The narrow tail may f L have been a defense weapon.

Tail Weapon
Tail contained 82 bones

Tail may have been I used like a whip against enemies

Defending the young Apatasaurus laid eggs in nests and probably protected its young. At one month old, Apatasaurus was about 6 ft (1.8 m) long, and the height of its parents' ankles. The adult may have reared up on its hind legs and whipped its tail to ward off any attackers.

Young Apatasaurus hides behind its parent f

Adult rears up in defense

Young Apatasaurus hides behind its parent

Adult rears up in defense

Neck bone Some of Barosaurus' neck bones were over 3 ft (1 m)

in length. The bones were hollowed out to reduce the weight of the 30-ft-long (9 m) neck.

The name sauropod means "lizard footed.'' All sauropods were herbivores.

Sauropods may have moved at up to 2V2 mph (4 km/h).

• Many types of sauropod traveled in herds.

• Some may have lived for up to 100 years.

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