Acrocanthosaurus

Unusual Physical Features and Bony Secrets

Acrocanthosaurus, whose scientific name means “high-spined lizard,” possessed a very unique appearance and remarkable physical abilities.

The Mysterious Back Spines and Their Role

The most distinctive feature of this dinosaur was the elongation of its neural spines, which formed a row of spike-like projections up to 60cm long running from its neck to its back in life.

A row of spike-like projections ran from its neck to its back.

While this structure is reminiscent of the sail of Spinosaurus, it is speculated that it was not a true sail but may have been covered in a fleshy membrane or a camel-like hump of muscle.
The projections are thought to have had roles in thermoregulation or as display features to attract mates, but their exact function is still unknown.

Powerful Forelimbs and Shark-like Teeth

Although Acrocanthosaurus was more slender in build than the power-type Tyrannosaurus, its teeth and forelimbs were very formidable.

Teeth

It had sharp teeth and powerful jaws. Because its teeth were prone to breaking, they were constantly and quickly replaced by new ones, much like a modern shark’s. This meant there was no functional problem in securing prey.

It Had Sharp Teeth and Powerful Jaws.

Forelimbs

Compared to other large carnivorous dinosaurs, its hands and arms were robust, and the claws on its fingers were more than sufficient for catching prey.

Hunting Abilities

Acrocanthosaurus did not rely on the “one-hit kill” power like the later Tyrannosaurus but instead hunted by relying on mobility and agility.

Speed

Fossilized tracks suggest that it could run at speeds of up to 40 km/h.
This is a very high level of athletic ability for a large dinosaur.

It Could Run at Speeds of Up to 40 km/h.

Hunting Style

It is believed to have been a swift hunter that chased down prey using its agility.

Fossil Quality

In addition to four well-preserved skeletal specimens, many footprints have been discovered.
These footprints have allowed research to progress significantly, offering clues about its movements while hunting.

With its unique appearance and high physical ability, Acrocanthosaurus dominated the ecosystem of the North American continent during the Early Cretaceous period.