Question 1

How do you say Ankylosaur?

Accepted Answer

Ankylosaur is pronounced ANK-ee-loh-sor. Break it into four parts: ANK, then ee, then loh, then sor. The stress lands on the first syllable, ANK, so that part gets said the loudest and most firmly. If you can say anchor, you already have the first part down perfectly.

Question 2

What does Ankylosaur mean?

Accepted Answer

Ankylosaur comes from two Ancient Greek words. Ankylos means bent, fused, or stiffened, and sauros means lizard. So the full meaning is roughly fused lizard or stiffened lizard. The name refers to the way an ankylosaur's body was locked together under a shell of fused bony armor plates, making it look and feel like one solid, rigid creature.

Question 3

How strong was an ankylosaur's tail club?

Accepted Answer

Research by paleontologist Victoria Arbour and others has calculated that an ankylosaur tail club could deliver a force of over 6,000 newtons on impact. That is enough force to shatter the leg bones of a large predator like a tyrannosaur. The tail was stiffened by fused vertebrae so it could swing like a rigid bat rather than a floppy rope, making the strike extremely powerful and accurate.

Question 4

What is an osteoderm and how is it different from a scale?

Accepted Answer

An osteoderm is a piece of bone that grows directly inside the skin, rather than sitting on top of it like a scale. The word comes from Greek roots meaning bone skin. Crocodiles, armadillos, and some lizards also have osteoderms today. In ankylosaurs, these internal bone plates grew into hundreds of different shapes and could fuse together to form a nearly solid shield across the back and neck.

Question 5

Did ankylosaurs have armor on their eyelids?

Accepted Answer

Yes, some ankylosaurs did have bony armor covering their eyelids. Fossils of Euoplocephalus, a North American ankylosaurid, clearly preserve small bony eyelid covers that could slide shut like a shutter over the eye. This suggests that protection was so important to these animals that even their eyes were armored against biting predators.

Question 6

When did ankylosaurs first appear?

Accepted Answer

The earliest confirmed ankylosaur fossils come from Morocco in North Africa and date back to the Middle Jurassic period, roughly 168 million years ago. This makes ankylosaurs one of the longer-surviving dinosaur groups, as they persisted all the way to the end of the Cretaceous period about 66 million years ago. That is over 100 million years of armored dinosaurs roaming the earth.

Question 7

What is the difference between an ankylosaur and a nodosaur?

Accepted Answer

Ankylosaur is the general term for the whole group, while nodosaur refers specifically to the family Nodosauridae, one of the two main branches within Ankylosauria. Nodosaurs lacked the bony tail club that ankylosaurids are famous for, but they often had larger shoulder and side spikes. The spectacularly preserved Borealopelta is a nodosaur. Ankylosaurids like Ankylosaurus had the famous tail club and typically a wider, flatter body shape.

Question 8

How many armor plates did an ankylosaur have?

Accepted Answer

The exact number varied by species, but some ankylosaurs had more than 200 individual osteoderms covering their body. In well-preserved specimens, scientists can count and map each plate individually. They ranged from tiny pebble-sized nodules packed between larger plates to massive keeled scutes the size of a dinner plate. The sheer number of pieces working together is part of what made ankylosaur armor so effective.

Question 9

Was the most famous preserved ankylosaur fossil really found by accident?

Accepted Answer

Yes. In March 2011, a heavy-equipment operator named Shawn Funk was digging at the Suncor Millennium Mine in Alberta, Canada, when his machine struck something unexpected about 15 feet underground. It turned out to be the nearly complete remains of Borealopelta markmitchelli, a 110-million-year-old nodosaur preserved in extraordinary detail, with skin, armor, and even original pigment chemicals still present. It is now on display at the Royal Tyrrell Museum of Palaeontology in Drumheller, Alberta.

Question 10

Could an ankylosaur really hurt a T. rex?

Accepted Answer

Paleontologists think it was genuinely possible. T. rex and Ankylosaurus lived at the same time in the same part of North America at the very end of the Cretaceous period. Some tyrannosaur bones have been found with injuries that could be consistent with blunt-force trauma. An ankylosaur's tail club could deliver devastating force to a predator's legs, feet, or ankles, potentially crippling it. A T. rex that broke its leg would likely not survive, so the ankylosaur had a real and serious weapon.

Question 11

Did ankylosaur armor help keep them warm or cool?

Accepted Answer

Some scientists think it might have helped with temperature regulation. Research has shown that the osteoderms of some ankylosaurs contain internal channels where blood vessels would have run through the bone. This is similar to structures in modern animals that use the skin to release body heat or absorb warmth from the sun. If ankylosaur armor worked like this, the bony plates would have served double duty as both a defensive shield and a body temperature management system.

Question 12

Are there ankylosaur fossils on every continent?

Accepted Answer

Ankylosaur fossils have been found on every continent except Australia, including Antarctica. Fossils from Antarctica, found on James Ross Island, confirm that these armored dinosaurs lived even in polar regions, though the climate was warmer back then than it is today. Their wide geographic spread across North America, Europe, Asia, Africa, and South America shows they were one of the most geographically successful dinosaur groups that ever lived.

Ankylosaur Pronunciation

What does Ankylosaur mean?

Name Roots

Fun Facts

Learn More About Ankylosaur

Related Anatomy Terms