Anatosaurus Facts
Pronunciation: an-AT-oh-SORE-us
Name meaning: Duck Lizard
| Diet | Herbivore |
| Height | 3.5m |
| Length | 12m |
| Weight | 4 tonnes |
| Speed | 25 km/h |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Ornithopod |
| Location | North America |
Although historically known as Anatosaurus, this impressive ornithopod is now scientifically recognised as Edmontosaurus annectens. This large duck-billed dinosaur lived during the very end of the Cretaceous period, between 72 and 68 million years ago, roaming the ancient landscapes of what is now western North America.
Anatosaurus was a magnificent ornithopod that could reach lengths of up to 12 metres and stand 3.5 metres tall at the hip. Unlike its crested relatives, it possessed a relatively flat skull without the elaborate hollow crests seen in other duck-billed dinosaurs. Its most distinctive feature was its broad, flattened snout that resembled a duck's bill, perfectly adapted for cropping low-growing vegetation.
As a herbivore, Anatosaurus spent its days browsing on ferns, conifers, and flowering plants that carpeted the Late Cretaceous floodplains. Its sophisticated dental system included hundreds of small teeth arranged in grinding surfaces called dental batteries, allowing it to efficiently process tough plant material. The creature could move both on two legs when speed was needed and on all fours whilst feeding.
Fossilised remains of Anatosaurus have been discovered in several famous geological formations, including the Hell Creek Formation and Lance Formation, dating to the final few million years before the great extinction that ended the age of dinosaurs.
What made Anatosaurus distinctive?
Anatosaurus had a distinctive flat, broad skull without the hollow crests typical of many other duck-billed dinosaurs. Its duck-like bill was perfectly adapted for cropping vegetation, and it possessed powerful hind limbs that allowed it to rear up on two legs when necessary.
Behaviour
Anatosaurus likely lived in herds, migrating seasonally across the Late Cretaceous floodplains in search of fresh vegetation. Evidence suggests these ornithopods could produce sounds through their nasal passages, possibly for communication within the herd during migrations or to warn of approaching predators like Tyrannosaurus rex.
Discovery
Anatosaurus was first described by Othniel Charles Marsh in 1892. The original fossils were discovered at Lance Formation, Wyoming, USA.
Anatosaurus FAQ
What did Anatosaurus eat?
Anatosaurus was a herbivore that fed on a variety of
Late Cretaceous plants including ferns, conifers, cycads, and early flowering plants. Its broad, duck-like bill was perfect for cropping vegetation, whilst its sophisticated dental batteries ground tough plant material into digestible pulp.
How big was Anatosaurus?
Anatosaurus was a large dinosaur, reaching up to 12 metres in length and standing about 3.5 metres tall at the hip. Adult specimens weighed approximately 4 tonnes, making them substantial herbivores that dominated their
Late Cretaceous ecosystems.
When did Anatosaurus live?
Anatosaurus lived during the
Late Cretaceous period, specifically between 72.2 and 68 million years ago. This places it right at the very end of the dinosaur age, just a few million years before the mass extinction event that ended the Mesozoic Era.
Where was Anatosaurus found?
Anatosaurus fossils have been discovered across western North America, particularly in famous fossil-bearing formations like the Hell Creek Formation in Montana and the Lance Formation in Wyoming. These sites have yielded numerous well-preserved specimens over the decades.
How do you pronounce Anatosaurus?
Anatosaurus is pronounced 'an-AT-oh-SORE-us', with emphasis on the second syllable. The name rolls off the tongue quite naturally when broken down into its component parts: 'an-AT-oh' followed by 'SORE-us'.
What does Anatosaurus mean?
Anatosaurus means 'Duck Lizard' in Greek, referring to the distinctive duck-like bill that characterised this dinosaur. The name perfectly captures the creature's most obvious feature - its broad, flattened snout that resembled a modern waterfowl's beak.
How fast could Anatosaurus run?
Scientists estimate that Anatosaurus could reach speeds of up to 25 km/h when running on its powerful hind legs. This speed would have been essential for escaping from large predators like
Tyrannosaurus rex that shared its
Late Cretaceous habitat.
What type of dinosaur was Anatosaurus?
Anatosaurus was an ornithopod dinosaur, specifically a member of the duck-billed dinosaur family Hadrosauridae. These were large, herbivorous dinosaurs known for their sophisticated dental systems and distinctive bill-like snouts adapted for processing plant material.
Was Anatosaurus related to birds?
As an ornithopod dinosaur, Anatosaurus was only distantly related to birds. Birds evolved from theropod dinosaurs, whilst Anatosaurus belonged to the ornithischian lineage. However, both groups shared common dinosaurian ancestors from much earlier in the Mesozoic Era.
How many Anatosaurus fossils have been found?
Numerous Anatosaurus specimens have been discovered since the 1890s, including several nearly complete skeletons. The abundance of fossils from formations like Hell Creek and Lance has made this one of the better-known duck-billed dinosaurs, though it's now classified under the name
Edmontosaurus annectens.
