Dino card No. 0565 of 2,027

Edmontonia

Say it: ed-mon-TOH-nee-uh

Name means: “named after Edmonton, the city and rock formation in Canada where it was first found”1

Ate: PlantsArmoured dinosLate Cretaceous

Edmontonia was a tank-like dinosaur covered in bony plates and sharp spikes. It walked on four legs and munched on low-growing plants. This nodosaurid dinosaur lived in western North America near the end of the Age of Dinosaurs.1

Lived

84 to 66 million years ago5

Late Cretaceous

Fossils found in

Canada (Alberta, Saskatchewan) and the United States (Alaska, Colorado, Montana, South Dakota, Texas)5

Food

Plants5

Length

6 to 6.6 m1

estimates vary

Weight

3 tonnes1

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 2 cars

as long as 7 dogs nose to tailas long as 37 bananas end to endas heavy as 100 big dogsas heavy as 600 watermelons

How big was Edmontonia compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

cool stuff

Fun facts

Edmontonia had four huge spikes sticking out from each shoulder, the largest of any nodosaurid. These spikes could have been used to fight other Edmontonia or to stab attacking predators.1

Its back and head were covered with small, oval bony plates that had a ridge down the middle. Its neck and shoulders were protected by three half-rings made of large keeled plates.1

Edmontonia lived alongside many other giant plant-eaters like the duck-billed dinosaurs Gryposaurus and Corythosaurus, and the horned dinosaurs Centrosaurus and Chasmosaurus.1

The only large predators that lived with Edmontonia were the tyrannosaurids Gorgosaurus and Daspletosaurus.1

Scientists think Edmontonia might have crouched down to protect its soft belly from predators, making it hard for a predator to flip it over.1

One species of Edmontonia, E. rugosidens, lived about 76.5 to 75 million years ago. The other species, E. longiceps, lived about 72 million years ago.1

AI-made picture of Edmontonia — An AI-made picture of how Edmontonia might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

you asked

Most asked questions about Edmontonia

?How big was Edmontonia?

Edmontonia was about 6 to 6.6 metres (20 to 22 ft) long and weighed around 3 tonnes (about 6,600 lb).1 3

?What did Edmontonia eat?

Edmontonia was an herbivore that ate low-growing plants like ferns and cycads. Its small teeth and weak jaws suggest it processed food differently than modern mammals.1 3 4

?Did Edmontonia have armor?

Yes, Edmontonia was covered in small oval bony plates on its back and head, and had three half-rings of large keeled plates protecting its neck and shoulders. It also had four huge spikes on each shoulder.1 3

?How fast could Edmontonia run?

No source gives a speed for Edmontonia, but its heavy armor and short, thick legs suggest it was slow-moving, like a tank.1 3

?Was Edmontonia bigger than T. rex?

No, Edmontonia was much smaller. T. rex could be over 12 metres (40 ft) long, while Edmontonia was only about 6 to 6.6 metres (20 to 22 ft) long.1

?When did Edmontonia live?

Edmontonia lived during the Late Cretaceous Period, about 76.5 to 68 million years ago.1 4

?Where was Edmontonia found?

Edmontonia fossils have been found in western North America, especially in Alberta, Canada, and also in the Talkeetna Mountains near Denali National Park in Alaska.1 3

?Could Edmontonia swim?

No source says Edmontonia could swim. Its heavy armor and short legs probably kept it on land.1

Ask Rex about Edmontonia

Rex only answers questions about this page. 3 questions a day.

Rex is an AI and can make mistakes. He runs on servers in the EU and questions are never saved. Never type your name or other personal things.

Myth buster

Myth: Edmontonia could swing its tail like a club to defend itself.

Truth: Edmontonia was a nodosaurid, not an ankylosaurid. Nodosaurids did not have a tail club. Instead, Edmontonia relied on its shoulder spikes and body armor for protection.1

For dino experts

Scientific name: Edmontonia
Named by: Sternberg 19285
Group: Armoured dinos
Family / clade: Nodosauridae5
Classification: Ornithischia > Ankylosauria > Nodosauridae > Thyreophora5
Age of the rocks: 84 to 66 million years (Campanian / Maastrichtian)5
Rock formations: Judith River, Aguja, Hell Creek5
Countries: USA, Canada5
Fossil records: 16 in the Paleobiology Database5
Also known as: Chassternbergia, Denversaurus (older names now counted as the same animal)5
Discovery: Edmontonia was named by Charles M. Sternberg in 1928. The first fossils, including a skull and much of the skeleton, were found near Morrin, Alberta, Canada in 1924 by George Paterson.1
Still debated: Scientists still debate whether the fossils called Denversaurus and Chassternbergia are really separate dinosaurs or just different species of Edmontonia.2

Where the facts come from

Edmontonia (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
Edmontonia - Denali National Park & Preserve (U.S. National Park Service) (nps.gov)
enchantedlearning.com (enchantedlearning.com)
Edmontonia in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are dino fans, not a science journal. Tell us at [email protected] and we will fix it.

Rex is hungry! Dino Wiki is a dad's project for his dino-loving son, free with no ads. Grown-ups can feed Rex a snack to help keep it online.Feed Rex