Bone Dragon

Bone Dragons are large, hydra-like dragon skeletons that Yoshis encounter underground in the game Yoshi's Story. Bone Dragons will usually be blocking the way, to get past them Yoshi will have to either throw Eggs at its head, or Ground Pound it, either way takes three hits. In a couple of cases Yoshi will encounter a three-headed Bone Dragon, complete with a body. Each of the heads take two hits and Yoshi will get three Melons when it is defeated. Touching the body won't hurt Yoshi. An underground cavern on Yoshi's Island, called the Bone Dragon Pit is also explored in Yoshi's Story; as its name would imply, the Bone Dragon Pit is infested with Bone Dragons. However, Bone Dragons were very uncommon enemies since they only appeared in that specific level.

Super Smash Bros. Brawl has a sticker of a Bone Dragon that raises the strength of attacks that involve biting by thirteen. It can only be used by Yoshi, Wario, Pokémon Trainer, and Wolf.

Trivia

 * Bone Dragons resemble skeletons of the monster from Greek mythology known as the Lernaean Hydra, a serpentine/draconic monster with multiple heads.
 * In the beta version of Yoshi's Story, Bone Dragons weren't skeletal at all and were purple and orange colored, multi-headed and were less sinister looking.
 * Another similar dragon named Bonetail appears in Paper Mario: The Thousand-Year Door, oddly both live in a pit.
 * A skeletal dragon resembling a Bone Dragon makes a small appearance in Mario Party 6 in Snowflake Lake, where it is frozen in a lake.
 * A similar rideable character named Bonecoaster appears in New Super Mario Bros. Wii and Super Mario 3D Land.