Bone Dragon

Bone Dragons are large dinosaur skeletons that Yoshis encounter underground in the game Yoshi's Story. Bone Dragons spit fire and can sometimes be found in groups of three. The weak spot of a Bone Dragon is found on their head, meaning a Yoshi will want to Jump on top of them and Ground Pound to defeat them. Another way to defeat a Bone Dragon is to hit them multiple times with eggs.

An underground cavern on Yoshi's Island, called the Bone Dragon Pit is also explored in Yoshi's Story; as it's 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.
 * 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 Sticker of a Bone Dragon appears in Super Smash Bros. Brawl.
 * A similar rideable character named Bonecoaster appears in New Super Mario Bros. Wii.