Gyro

Gyros were introduced in The Binding of Isaac: Repentance. They look like a piece of meat with a bone right through the middle.

They move themselves by rolling--similar to how a wheel moves. When Isaac is in their line of sight, they charge at him.

Turns into Grilled Gyro, if in contact with fire.

Grilled Gyro
Grilled Gyros function relatively the same to normal Gyros, but they move at a faster pace.

Trivia

 * Edmund has expressed that this enemy doesn't fit in the game because it does not have a face like the other enemies.