Yooks are a species found in The Legend of Zelda: Phantom Hourglass for the Nintendo DS. They can be found on the Isle of Frost along with their opponents the Anouki. Both have had a hatred for each other, though one hundred years prior to the events in the game the two settled an agreement that stated that the Anouki would get the western side and the Yook would live on the east side of the islands, with the Anouki knowing full well that they were getting the better part of the bargain.
They're a violent species and will attack mostly anyone who's not a member of their tribe. Their sole weakness will appear after they suck in a breath of air, which will allow Link to toss a bomb in their mouths. There are two different types of Yook - white and black ones, with the latter being better fighters, and the former being better defenders.