Maulwurf

The Maulwurf is a large and fearsome mole-like creature that appears as the main antagonist in the episode To Change a Chageling from the animated television show My Little Pony: Friendship is Magic.

Appearance
It is described by Starlight Glimmer as "half-bear, half-mole, half-raging-pile-of-claws". The maulwurf mostly resembles a giant star-nosed mole with blue fur, large forearms, and multiple light-blue appendages around its snout. It has an extremely thick hide, allowing it to shrug off magic blasts from a unicorn, and withstand having a large chunk of rock thrown at its head.

Role in the series
It menaces the changelings and eats all the plants that grow around their kingdom.

Outside the kingdom, Starlight lays a trail of leaves to lure the maulwurf to the hive. Her plan is to have Pharynx save the hive from the maulwurf so that the rest of the changelings will finally accept him. Unfortunately, Trixie cannot find Pharynx anywhere; having overheard their earlier conversation, Pharynx has apparently left the kingdom on his own.

Somewhere in the desert, Starlight, Trixie, and Thorax find Pharynx battling the rampaging maulwurf on his own. They try to help him, but the maulwurf's thick hide makes it impervious to most of their attacks. Suddenly, the rest of the Changeling swarm appears to provide support, but they are unable to help much due to being out of combat practice.

Pharynx comes up with an idea inspired by how he used to tease Thorax when they were little, and the changeling brothers team up flying near the maulwurf to make the beast hit itself over and over — a blow to his face, one in the stomach, another two tougher in the face, another in the stomach, and the final blow it's a heavy bite in the paw —. When the maulwurf's stamina is worn down enough, it retreats underground.

Trivia

 * The word "maulwurf" is German for "mole", the animal on which it is based.