|There is more information available on this subject at Yaks on the English-language Wikipedia.|
Yaks a long haired bovine (cow) animals that are a celebrated animal of the people of Yaksgiving, who use its meat as food.
These hairy cow-like beasts are dropped on hapless family members during the third and fourth day of Yaksgiving, and then a stampede of them called a "Yak Attack" is unleashed on the fifth day. Their meat is used in a variety of foods, such as Yak Burgers, which Grandpa Vlad and Grandma Gladys used to pioneer Yak in the Box, a fast food yak-meat serving restaurant in Dimmsdale. Strangely, they don't eat any Yak during the Yaksgiving Feast, instead choosing to eat more disgusting and bland foods.
They were seen two colors, red and gray, and look like bulls with horns pointing to the side.