Mazura

Horsehead is the first boss Link encounters in The Adventure of Link. He is found in Parapa Palace and wields a powerful club. Link can be knocked back significantly harder when struck by Horsehead's club, compared to length Link is knocked back by other enemies. He is defeated by striking his head, which is his only vulnerable point, multiple times.

Captain N: The Game Master
Horsehead appears in the "Quest for the Potion of Power" episode of Captain N: The Game Master. He appears after Link takes the Golden Key in the Parapa Palace, revealing himself to be the guardian of the key. Link decides to fight Horsehead alone, but he is easily bested by the monster and loses his sword after one of the monster's attacks, leaving the young hero defenseless. Just as Horsehead is about to deliver a deadly blow to Link, Kevin rescues Link and defeats Horsehead instead by remembering his weakness: his head. Knowing so, Kevin shoots at the ceiling using his Zapper, causing the ceiling to collapse on top of Horsehead and thus dispose of Horsehead.

Trivia
In the Japanese version of the game, Horsehead roars.