Question 1

How do you say Theropod?

Accepted Answer

Theropod is pronounced THAIR-oh-pod, with the stress on the first syllable. The 'th' sounds like the 'th' in 'there' or 'they,' not like the 'th' in 'think.' Break it into three clean parts: THAIR, then oh, then pod, and you have it exactly right. It rhymes roughly with 'hair-oh-nod' if that helps you remember.

Question 2

What does Theropod mean?

Accepted Answer

Theropod comes from two Greek words: therion, meaning wild beast or animal, and pous or podos, meaning foot. Put together, it means something like 'beast foot' or 'wild beast foot.' The name was chosen in 1881 by paleontologist Othniel Charles Marsh to describe the powerful, three-toed feet that make this group of dinosaurs easy to identify. Those distinctive beast feet are so recognizable that scientists can identify a theropod from its fossilized footprints alone.

Question 3

Are birds really dinosaurs?

Accepted Answer

Yes, birds are genuinely, scientifically classified as theropod dinosaurs, not just distant relatives. They evolved from small feathered coelurosaur theropods during the Jurassic period, roughly 150 to 160 million years ago, and their skeletons share dozens of features with non-bird theropods including hollow bones, wishbones, and three-toed feet. This means the roughly 11,000 species of birds alive today are the only surviving branch of the dinosaur family tree. When you watch a chicken walk, you are watching a theropod dinosaur in action.

Question 4

What is the biggest theropod ever?

Accepted Answer

The largest theropod known to science is Spinosaurus aegyptiacus, estimated at up to 46 to 59 feet long and potentially over 20,000 pounds. It lived in North Africa about 95 to 100 million years ago and was adapted for hunting fish in rivers, with a long crocodile-like snout and dense bones that helped it stay submerged. A famous partial skeleton was discovered in Egypt in 1912 by German paleontologist Ernst Stromer, but it was destroyed in a British bombing raid on Munich in 1944. New material discovered in Morocco in the 2010s allowed scientists to revise and significantly update our understanding of this giant.

Question 5

What did theropods eat?

Accepted Answer

Most early and ancestral theropods were carnivores that hunted other animals, and the group is famous for its predatory members like Tyrannosaurus rex, Allosaurus, and Velociraptor. However, many theropod groups later evolved to eat plants, seeds, eggs, insects, or a mix of different foods. Therizinosaurs became dedicated plant-eaters with enormous claws for pulling down vegetation. Ornithomimosaurs may have been omnivores that scooped up small creatures and plant material alike. Modern birds, which are theropods, eat everything from nectar and seeds to fish, rodents, and other birds.

Question 6

Did theropods have feathers?

Accepted Answer

Many theropods definitely had feathers, and fossil evidence from China has confirmed this beyond any scientific doubt for the coelurosaur branch of the family. Fossils from the Yixian Formation in Liaoning Province, discovered in large numbers since the 1990s, preserve feather impressions on theropods including Sinosauropteryx, Microraptor, and Yuanchuavis. Scientists believe feathers may have been even more widespread across theropods than currently confirmed. Large theropods like adult T. rex likely had scaly skin over most of their bodies based on skin impressions found with some specimens, though juveniles may have had a fuzz of proto-feathers.

Question 7

How many types of theropods are there?

Accepted Answer

Scientists have named well over 500 species of non-bird theropods from the fossil record, and new species are described every year as new fossils are found around the world. When you add the roughly 11,000 living species of birds, all of which are theropods, the total number of theropod species living and extinct runs into the thousands. Theropods lived on every continent including Antarctica, and they occupied an enormous range of ecological roles from tiny insect-eaters to the largest land predators in Earth's history. The group's diversity rivals that of any other vertebrate lineage.

Question 8

Who named the theropods?

Accepted Answer

The group Theropoda was formally named by American paleontologist Othniel Charles Marsh in 1881. Marsh was one of the most prolific dinosaur hunters in history, and he named the group during his fierce rivalry with fellow scientist Edward Drinker Cope in a period historians call the Bone Wars. Marsh chose the Greek-derived name to highlight the distinctive three-toed, beast-like feet of the group. He personally described and named many famous theropods himself, including Allosaurus fragilis in 1877 and Ceratosaurus nasicornis in 1884.

Question 9

What is the smallest theropod?

Accepted Answer

Among non-bird theropods, some of the smallest known species include Microraptor gui from China, which was roughly the size of a crow at about 2.5 pounds, and Parvicursor remotus from Mongolia, estimated at around 3.5 ounces, making it comparable in weight to a small songbird. If you include living birds, which are theropods, then the bee hummingbird of Cuba holds the record as the smallest theropod alive today, weighing less than 0.07 ounces and measuring just over 2 inches long. Size in theropods ranged from that tiny hummingbird all the way up to Spinosaurus at potentially over 20,000 pounds.

Question 10

How did theropods walk?

Accepted Answer

Theropods walked on two legs in an upright posture, with their backbone held roughly horizontal and their long tail extended behind them for balance. Unlike the sprawling posture of modern lizards, theropods held their legs directly beneath their bodies, similar to the way birds and mammals walk. This upright, two-legged stance is called bipedal locomotion, and it gave theropods significant advantages in speed and agility. Fossilized trackways show that many theropods walked with a narrow gait, placing their feet close to the midline of their bodies rather than wide apart, which is another feature shared with modern birds.

Question 11

What period did theropods live in?

Accepted Answer

Theropods first appeared during the Late Triassic period, roughly 231 to 228 million years ago, based on fossils like Eoraptor and Eodromaeus from Argentina. They diversified enormously through the Jurassic period, from about 201 to 145 million years ago, and reached their peak diversity and size during the Cretaceous period, from about 145 to 66 million years ago. The non-bird theropods were wiped out along with most other dinosaurs in the mass extinction 66 million years ago caused by an asteroid impact. Bird-lineage theropods survived that extinction and continue to thrive today, meaning theropods as a group have now been around for over 230 million years.

Question 12

Is T. rex a theropod?

Accepted Answer

Yes, Tyrannosaurus rex is one of the most famous theropods of all time. It belongs to the theropod subgroup called tyrannosaurids, within the larger grouping of coelurosaurs. T. rex had all the classic theropod features: two-legged stance, hollow bones, three main weight-bearing toes, and a pubic bone pointing forward in the saurischian hip arrangement. It lived at the very end of the Cretaceous period, about 68 to 66 million years ago, and its fossils have been found across western North America. Despite its tiny-looking arms, T. rex was capable of lifting several hundred pounds with each limb.

Question 13

Did theropods live in groups?

Accepted Answer

Evidence for theropod group behavior is genuinely mixed and varies by species. Some fossil trackway sites appear to show multiple large theropods moving in the same direction at the same time, which some paleontologists interpret as evidence of pack or group behavior, though others argue the tracks were simply made at different times. A site called the Davenport Ranch trackway in Texas shows what may be a group of large sauropod-hunting theropods moving together. Modern birds, which are theropods, show an enormous range of social behaviors from completely solitary species to enormous colonial nesters. It is likely that social behavior in non-bird theropods was similarly variable across the many different species.

Theropod Pronunciation

What does Theropod mean?

Name Roots

Fun Facts

Learn More About Theropod

Related Anatomy Terms