Skeletal wyvern tail-bone

The Wyvern tail-bone is an item on the Odd Old Man's wishlist after the Fur 'n' Seek quest, and is dropped by the Skeletal Wyvern. It shouldn't take more than 20 kills to get a bone drop. 8 other tail bones are needed from Green Dragons, Blue Dragons, Black Dragons, Red Dragons, Iron Dragons, Steel Dragons, Mithril Dragons and Bronze Dragons to complete this miniquest.