Brainy Yak's Mother is a female yak and the mother of Brian (also known as Brainy-Yak). Before Professor Moshimo became the world-renowned scientist, he was a farmer in Mexico. Brainy Yak's mother was one of Professor Moshimo's yaks. One day she walked away from the group. When Dave wants to bring her back, Moshimo stops him and goes after her. He then discovers that she is giving birth to Brian and he helps her with the birth. When Dave comes to Kaziland to bring Brian back, he reveals that his mother is waiting for him.