Tibetan Yeti

Tibetan Yeti, also known as  Abominable Snowmen, were anthropoid creatures native to Earth. Robotic semi-replicas of the species were constructed by the Great Intelligence. They dwelt in the Himalayas in Tibet.

Little was known about them, except that they were large, furry, probably semi-sapient humanoids and naturally timid.

They were generally thought to be myths by Humans from the West. Professor Travers went on an expedition to find them. After an adventure with the Robot Yeti, Travers finally spotted one and went in pursuit. (DW: The Abominable Snowmen)

Decades later, a team of monster hunters attempted to photograph the elusive Yeti and were captured by the Great Intelligence. Lama Gampo, a monk who had sworn to protect the world from the Intelligence, blew a great horn and called the real Yeti who howled in response and descended the mountains to fight with their robotic counterparts. (DWM: Yonder... The Yeti)

Possible Mentions
According to Bea Nelson-Stanley, the Sultan of Ishkanbar had seen a Yeti. (SJA: Eye of the Gorgon)

The Museum of Things That Don't Exist had nine different varieties of Yeti that all supposedly don't exist. However, the inaccuracy of a number of exhibits has been called into question. (EDA: The Taking of Planet 5)

Behind the Scenes
Because of the "wiping" of The Abominable Snowmen from the BBC's archives, no photographic documentation of a Doctor Who "real" Yeti exists. Doctor Who historians believe that the production team merely used one of the same costumes as one of the robot Yeti, with some of the padding removed.