Pachyrhinosaurus

Pachycephalosaurus

Heavy tali

Hard head

Powerful legs

What was a nasal boss?

One of the horned dinosaurs, | A Pachyrhinosaurus, has a name that means "thick-nosed lizard." On its nose— where its cousins had a sharp horn— Pachyrhinosaurus had a big bony knob. This was the nasal boss. Rival family members may have scrapped with each other, using their nasal bosses as weapons.

Pachyrhinosaurus

Lump of thick bone

Pachyrhinosaurus

Lump of thick bone

Antarctopelta

More Facts

■ Some ankylosaurs were so well-protected they even had bony eyelids.

■ Dinosaur remains were first found in Antarctica in 1986, with the discovery of the bulky ankylosaur Antarctopelta.

Psephoderma was a marine reptile. Its body was covered in heavy hexagonal plates, like a modern turtle.

Triceratops Skin Scutes

Who had bulletproof skin?

| A Recent research has shown that the skin on the backs and tails of some of the ankylosaurs was virtually bullet-proof— and certainly tooth-proof. The big scutes, smaller irregular plates, and the hexagonal plates interlocked to make the skin so tough and light that experts have likened it to fiberglass.

Which dinosaur is bone-headed?

Pachycephalosaurus was an ugly beast. It had a dome-shaped head edged with horny bumps, and several short bony spikes on its nose. The dome was made of solid bone, which was a whopping 10 in (25 cm) thick. Pachycephalosaurus may have used its head as a battering ram against attacking predators—or each other.

Were any sauropods armored?

| A Although most of the sauropods relied on their size to defend themselves, some of them were lightly armored, too. Saltasaurus had two types of armor. Its back and neck were covered in fist-sized bony scutes, and much smaller lumps toughened the skin all over its body.

Dinosaurs With Frill Their Head

Were frills defensive?

The plated and horned groups of dinosaurs developed some impressive features. They had great frills edged with studs and spikes around their heads, or triangular plates of skin and bone along their backs. Some were used in fighting. But experts believe that some dinosaur features were just for display. Like a peacock's colorful fan of feathers, a male Pentaceratops's head frill may have been used to help it attract a mate.

Styracosaurus Skull
Styracosaurus skull

Large neck frill

Pentaceratops

Which dinosaur had the spikiest frill?

| A Styracosaurus was one of the most spectacular looking of the horned dinosaurs. Its head broadened into a large frill that covered the back of its neck. Six long spikes flared from the top of the frill, and the sides were edged with studs. Styracosaurus also had a big horn on its snout, but seemingly no horns above its eyes.

Plain, bulky body

Pachyrhinosaurus Battering Ram

Could a skull be a battering ram?

Triceratops, or "three-horned face," had a short nose horn and two long horns above its eyes. Its neck frill was edged with bony studs. About 50 Triceratops skulls have been discovered, and many of them show scarring. This is strong evidence that the dinosaur used its tough skull as a weapon against larger predators.

Triceratop Dinosaur With Horned Frill
Horns
Triceratops Skeleton Head

Did horned dinosaurs fight each other?

| A The horned dinosaurs would have fought off attacking theropods, but they probably also clashed with each other. They may have crashed their heads together, damaging each other's frills with their horns and spikes, or locked horns and shoved. Such battles would have been fought over territory or potential mates.

Arched back

Large, bony plates

Sharp tail

Sharp tail

Arched back

Large, bony plates

Dinosaur Bony Plates

What were Stegosaurus's plates for?

The bony plates running along Stegosaurus's back were almost certainly not weapons. Experts think they were covered in skin, making them quite soft, with blood vessels (veins) inside. If this is correct, the plates may have helped to regulate body temperature. They would have absorbed the Sun's heat, warming up Stegosaurus.

More Facts

■ The plant-eating dinosaur Protoceratops had a neck frill, but the males had much bigger frills than the females. This support« the idea that frills attracted females.

■ The head of Styracosaurus was taller than an average-sized man!

■ Some dinosaurs, including Stegoceras, had bony thickenings on their skulls. They were too fragile to provide self-defense and were probably used to attract mates.

Stegoceras m

Stegoceras

Which dinosaur had a main sail?

The big carnivore Spinosaurus had spines up to 6 ft (2 m) long along its back. These were connected by skin, making the feature look like a sail. This sail may have helped Spinosaurus keep cool in the hot African climate, or simply been used for display—to attract a mate.

Spinosaurus Facts
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Responses

  • SAMPSA HURSTI
    Which dinosaur lived first pachirhinosaurus, t rex or stegasaurus?
    5 years ago
  • Joseph
    Are the stegosaurusus plates sharp?
    3 years ago

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