Here's why:
* Yaks are bovines: They are members of the Bovidae family, which includes cows, buffalo, and other related animals.
* Yaks are mammals: Like apes, yaks are mammals, but they belong to a different order (Artiodactyla) than primates (the order that includes apes).
* Yaks have distinct features: Yaks are known for their long, shaggy fur, sturdy build, and curved horns. These features are more similar to oxen than apes.
So, while both yaks and apes are mammals, they are very different creatures with distinct evolutionary paths.