Therizinosaurus Facts
Pronunciation: THER-ih-ZY-no-SORE-us
Name meaning: Scythe Lizard
| Diet | Herbivore |
| Height | 5m |
| Length | 16m |
| Weight | 5 tonnes |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Theropod |
| Location | Mongolia |
Therizinosaurus was one of the most extraordinary theropods ever to walk the Earth, living approximately 72 million years ago during the Late Cretaceous period in what is now Mongolia. Despite being a theropod—a group traditionally known for fierce predators like Tyrannosaurus—this colossal dinosaur was a peaceful plant-eater that represented one of evolution's most remarkable transformations from carnivore to herbivore.
Standing up to 5 metres tall at the hip and reaching lengths of 16 metres, Therizinosaurus was truly gigantic, weighing an estimated 5 tonnes. Its most striking feature was its enormous claws, some of the largest ever discovered, measuring over a metre in length. These fearsome-looking talons weren't used for hunting prey, but rather for pulling down high branches and stripping leaves from trees, much like a giant prehistoric sloth.
The dinosaur's massive body was supported by powerful legs, whilst its long neck allowed it to reach vegetation at considerable heights. Its relatively small head housed a beak-like mouth perfectly adapted for cropping plants. The discovery of Therizinosaurus has been particularly challenging for palaeontologists, as only fragmentary remains have been found, including those famous gigantic claws and various limb bones.
Living in the lush forests and river plains of Late Cretaceous Asia, Therizinosaurus shared its habitat with other giants like Tarbosaurus and various duck-billed dinosaurs, representing the incredible diversity of dinosaur life just before their extinction.
What made Therizinosaurus distinctive?
Therizinosaurus possessed the largest claws of any animal ever discovered, with some measuring over a metre in length. Despite its fearsome appearance, this massive theropod had a relatively small head with a beak-like mouth adapted for plant-eating, creating a striking contrast with its enormous size and intimidating talons.
Behaviour
Therizinosaurus likely spent much of its time using its massive claws to pull down high branches and strip leaves from trees, feeding in a manner similar to modern ground sloths. Its enormous size would have made it relatively safe from most predators, though it may have used its giant claws defensively if threatened by large carnivores like Tarbosaurus.
Therizinosaurus in Popular Culture
Therizinosaurus has appeared in several dinosaur documentaries and video games, often portrayed as a gentle giant with fearsome claws, though it remains less famous than other large dinosaurs.
Discovery
Therizinosaurus was first described by Evgeny Maleev in 1954. The original fossils were discovered at Nemegt Formation, Gobi Desert, Mongolia.
Therizinosaurus FAQ
What did Therizinosaurus eat?
Therizinosaurus was a herbivore that fed on plants, leaves, and branches. Despite being a theropod—a group known for meat-eaters—this giant had evolved to become completely vegetarian, using its massive claws to pull down high vegetation and its beak-like mouth to crop plants.
How big was Therizinosaurus?
Therizinosaurus was enormous, standing about 5 metres tall at the hip and reaching 16 metres in length—roughly the size of a large school bus. It weighed approximately 5 tonnes, making it one of the largest theropod dinosaurs ever discovered.
When did Therizinosaurus live?
Therizinosaurus lived during the
Late Cretaceous period, approximately 72.2 million years ago. This was near the end of the age of dinosaurs, just a few million years before the mass extinction event that ended their reign.
Where was Therizinosaurus found?
Therizinosaurus fossils have been found in Mongolia, specifically in the famous Nemegt Formation of the Gobi Desert. The first remains were discovered in 1948 by a Mongolian expedition, though the dinosaur wasn't formally described until 1954.
How do you pronounce Therizinosaurus?
Therizinosaurus is pronounced 'THER-ih-ZY-no-SORE-us'. The name can be tricky to say at first, but breaking it down into syllables makes it easier: THER-ih-ZY-no-SORE-us.
What does Therizinosaurus mean?
Therizinosaurus means 'scythe lizard' in Greek, referring to its enormous sickle-shaped claws. The name was chosen because these massive curved talons were the most striking feature of the early fossil discoveries.
How fast could Therizinosaurus run?
The speed of Therizinosaurus is unknown due to limited fossil evidence. Given its massive size and presumed lifestyle as a slow-moving browser feeding on vegetation, it likely wasn't built for speed but rather for power and reach.
What type of dinosaur was Therizinosaurus?
Therizinosaurus was a theropod dinosaur, belonging to the family Therizinosauridae. This makes it unusual because most theropods were carnivorous predators, but Therizinosaurus had evolved to become a giant plant-eater whilst retaining its theropod body plan.
Was Therizinosaurus related to birds?
Yes, as a theropod dinosaur, Therizinosaurus was part of the same group that gave rise to modern birds. Theropods are the direct ancestors of birds, though Therizinosaurus itself was far too large and specialized to be closely related to any flying species.
How many Therizinosaurus fossils have been found?
Very few Therizinosaurus fossils have been discovered, making it one of the most mysterious large dinosaurs. Only fragmentary remains are known, including the famous giant claws, some arm and leg bones, but no complete skeleton has ever been found.
