Anatomy: Polacanthus was about 12 feet (4 m) long and about 4.8 feet (1.5 m) tall. It was a bulky quadruped that relied on its many rows of bony spikes for protection.

Diet: Polacanthus was an herbivore, a plant-eater.

Fossils: Fossils of this ankylosaurid have been found in England. Polacanthus was named by Hulke in 1881. The type species is P. foxii.