Triceratops horridus

Overview

This dinosaur’s face was framed by three horns and a large neck frill. Triceratops horridus, a species of Triceratops, represents the plant-eating dinosaur world of North America at the end of the Cretaceous.^[1]

Key facts

The beak at the front grasped and cut plants, while teeth farther back processed food into small pieces. Its large head ornaments easily attract attention, but the mouth also contained tools for a plant-eating life.^[1]

Time and place

It lived in North America at the end of the Cretaceous, about 68–66 million years ago. Fossils from the Hell Creek Formation in Montana provide important evidence for studying the varied forms of Triceratops and their changes through time.^[2][1]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

Two long horns above the eyes, a horn above the nose, and a broad frill extending backward are striking features. Four legs supported the large body. Fossil horns are the inner bony cores; in life, a keratin covering surrounded them.^[1]

Habitat and reproduction

It ate plants using a beak and slicing teeth. The possibility that it fed on low vegetation is discussed, while its head ornaments may have served for recognition or signaling among members of the same species as well as defense.^[1]

Fossil discovery

The history of understanding Triceratops began with an unexpected misunderstanding. Horn bones reported in 1887 were initially interpreted as belonging to a giant bison. As more skulls emerged, the form of the three-horned dinosaur became clear.^[1]

References

1. Triceratops
2. Evolutionary trends in Triceratops from the Hell Creek Formation, Montana
3. Carnegie Museum of Natural History — Protoceratops andrewsi

Research questions

Do skull differences indicate a new species or changes during growth? Researchers compare growth stages alongside the sequence of rock layers. The large frill remains excellent material for asking questions about dinosaur growth and evolution.^[2][1]

Observation

In the illustration, do more than count the three horns: examine the beak and frill as parts of one head structure. The contrast between a plant-eating mouth and head ornaments gives this dinosaur its distinctive character.^[1]