Bone Dragons in the beta version of Yoshi's Story.
Bone Dragons are enemies in Yoshi's Story.
It takes three eggs thrown or ground pounds on the head to defeat them. In the beta version of Yoshi's Story, they were large and purple with orange frills on their heads with white bellies and spots. In their skeleton state, they have green glowing eyes. Most which are single heads get defeated and heart coins appear. Some of them have three heads and a body. In that case, Yoshi or your colour is awarded with three Melons when it's defeated.
Yellow Yoshi Throwing an Egg at a Bone Dragon