Dinosaurs did not all eat the same things, and their diets shaped how prehistoric ecosystems worked. Some dinosaurs browsed on ferns, cycads, conifers, horsetails, and later flowering plants, while others hunted animals or scavenged remains. Paleontologists study dinosaur diets to understand food webs, habitats, behavior, and evolution.
Diet evidence helps connect dinosaur body shapes to the environments they lived in.
Key Facts
- Herbivores ate plants such as ferns, cycads, conifers, horsetails, ginkgoes, and later flowering plants.
- Carnivores ate other animals, including dinosaurs, small vertebrates, fish, insects, eggs, and carrion.
- Omnivores ate both plant and animal foods, which may have helped them survive in changing environments.
- Diet percentage = food type eaten ÷ total food eaten x 100.
- Tooth shape is a major clue: flat teeth often grind plants, while sharp serrated teeth cut meat.
- Fossil evidence for diet includes teeth, jaws, stomach contents, coprolites, bite marks, and bone chemistry.
Vocabulary
- Herbivore
- A herbivore is an animal that mainly eats plants.
- Carnivore
- A carnivore is an animal that mainly eats other animals.
- Omnivore
- An omnivore is an animal that eats both plants and animals.
- Coprolite
- A coprolite is fossilized dung that can reveal what an animal ate.
- Food web
- A food web is a network of feeding relationships that shows how energy moves through an ecosystem.
Common Mistakes to Avoid
- Assuming all large dinosaurs ate meat is wrong because many huge dinosaurs, including sauropods, were plant eaters.
- Using tooth size alone to identify diet is wrong because tooth shape, wear patterns, jaw motion, and fossil context all matter.
- Thinking every sharp-toothed dinosaur was an active hunter is wrong because some carnivores also scavenged dead animals.
- Treating one fossil clue as final proof is wrong because paleontologists usually combine evidence from teeth, bones, dung, stomach contents, and habitat.
Practice Questions
- 1 A coprolite sample contains 60 plant fragments, 25 insect parts, and 15 bone fragments. What percentage of the sample is plant material?
- 2 In a fossil site, paleontologists find 40 herbivore fossils, 12 carnivore fossils, and 8 omnivore fossils. What fraction and percentage of the fossils are carnivores?
- 3 A dinosaur has broad leaf-shaped teeth, heavy tooth wear, and fossils found near abundant cycad and fern remains. Explain what diet is most likely and which evidence supports your conclusion.