Fun:Yak

Yaks are what Tibetans use instead of goats. They also use Yaks for the purpose of producing yak-butter tea, as well as Yak racing. Some even play Yak polo. Fewer dress as yaks, or view yak porn.

It has been noted that the Yak platformed to replace the goat in the now famous political appeal "yakkity yak, don't talk back", clearly a challenge to goats everywhere, to shape up or get out of politics.

Other uses
"Yak" is also the sound you make when you chuck your Cheerios. In the timeless classic roguelike game Nethack, eating tripe causes the game to tell you: "Yak -- dog food!".

There is also a Yak Aircraft Corporation in Russia. They mostly make military planes. They have a few plans for making airliners, so that Russian air travellers can say they rode there on a Yak.

The 1958 song Yakkity-yak by The Coasters may or may not relate to what consenting yaks do in private.