You can take the form of a dragon.
Prerequisites: Wis 19, Knowledge (nature) 15 ranks, wild shape ability.
Benefit: You can use your wild shape ability to change into a Small or Medium dragon. You gain all the extraordinary and supernatural abilities of the dragon whose form you take, but not any spell-like abilities or spellcasting powers.
Source: Draconomicon, page 105. The descriptor was changed from [General] to [Wild].