Wargs

 

Wargs are people with the ability to enter the minds of animals and perceive the world through their senses and even control their actions. The act of doing this is called "warging"

 

The ability starts out as vivid dreams in which the warg sees and perceives the world through the senses of an animal. Over time and with practice a warg can enter the mind of an animal at will. A warg's human body will become comatose when his consciousness leaves it to enter the mind of an animal, and his eyes will glaze over white, until his consciousness returns to his own body.

Warging is a separate ability from Greensight, the psychic ability to perceive future and past events in dreams. However, some people who are wargs can also possess greensight.

Wargs cannot easily enter the minds of other humans to control their actions, though few even attempt it. Bran Stark, with no prior experience at warging, was able to enter the mind of another human, demonstrating his powerful innate abilities. The human whose mind he entered, however, was Hodor, a mentally challenged man, and as yet no warg has been seen totally taking over the mind of another person who possesses full adult mental capacities.