Yurarin Boo

Yurarin Boo are fire-breathing seahorse enemies found in Muda Kingdom in Super Mario Land. Unlike their little brothers, the Yurarin, Yurarin Boos can move up and down shooting fireballs. On some occasions, Yurarin Boo can also be found outside of the water. They are also known to be invincible to Superballs. To defeat one, Mario has to stomp one's head or shoot it with two of the Marine Pop's torpedoes. Defeating one awarded Mario with 400 points. Yurarin Boo are more common than Yurarin, even though they are stronger. They appear in all three levels of Muda Kingdom. Dragonzamasu, the boss of the Muda Kingdom, resembles these creatures.

In the Game Boy comic books spun off from the Nintendo Comics System, produced by the company Valiant, Yurarin Boos made cameos where they could fly, and be used as mounts by Pionpi.

Super Mario Land

 * Instruction booklet: "This is the big brother of Yurarin. It moves up and down spitting out fireballs, and a superball as no effect on it."
 * Game Boy Player's Guide: "These super seahorses leap from the water and spit fire."
 * 3DS Virtual Console manual: "This is the big brother of Yurarin. It moves up and down, spitting out fireballs. Superballs have no effect on this creature."