is a creature supposedly employed by Japanese kitsune

Kitsune

is the Japanese word for fox. Foxes are a common subject of Japanese folklore; in English, kitsune refers to them in this context. Stories depict them as intelligent beings and as possessing magical abilities that increase with their age and wisdom. Foremost among these is the ability to assume...

-tsukai, those who use foxes

Kitsune

is the Japanese word for fox. Foxes are a common subject of Japanese folklore; in English, kitsune refers to them in this context. Stories depict them as intelligent beings and as possessing magical abilities that increase with their age and wisdom. Foremost among these is the ability to assume...

 as spirit familiars. Its use is described in various books, as follows:

In the the kuda-gitsune is described as a rat-sized fox which can be kept in a pipe.

According to the the kanko is a fox the size of a weasel or rat, with vertical eyes and thin hair. The magic-user summons the kanko to appear inside a bamboo pipe which he is holding, whereupon the fox will answer all the questions it is asked. The origin of this practice is traced back to a yamabushi

Yamabushi

' are Japanese mountain ascetic hermits with a long tradition as mighty warriors endowed with supernatural powers. They follow the Shugendō doctrine, an integration of mainly esoteric Buddhism of the Shingon sect, with Tendai and Shinto elements...

who obtained this art while undergoing strict asceticism on Mount Kinpu

Mount Kinpu

, or is a mountain of the Okuchichibu Mountains, and located on the boundary of Nagano Prefecture and Yamanashi Prefecture, Japan.It is one of the 100 Famous Japanese Mountains. At 2599m tall, it is the second highest peak of the Okuchichibu Mountains.-See also:...

. These Kanko are said to be numerous in the northern mountains of Suruga

Suruga Province

was an old province in the area that is today the central part of Shizuoka prefecture. It was sometimes called . Suruga bordered on Izu, Kai, Sagami, Shinano, and Tōtōmi provinces; and had access to the Pacific Ocean through Suruga Bay.-History:...

, Tōtōmi

Totomi Province

was a province of Japan in the area of Japan that is today western Shizuoka Prefecture. Tōtōmi bordered on Mikawa, Suruga and Shinano Provinces. Its abbreviated form name was .-History:...

, and Mikawa Province

Mikawa Province

is an old province in the area that today forms the eastern half of Aichi Prefecture. It was sometimes called . Mikawa bordered on Owari, Mino, Shinano, and Tōtōmi Provinces....

s.

Researcher Inoue Enryō

Inoue Enryo

, Japanese, Buddhist philosopher, educator, and nationalist; one of the most influential Buddhists of the Meiji era. Ordained as a priest in his father's Jodo Shinshu Ōtani branch 眞宗大谷派. Graduated with a doctorate from Tokyo Imperial University in 1896 focusing mainly on Western philosophy...

 in his , quotes a newspaper article regarding the kanko, in which it is a tiny, mouse-sized creature which hails from Shinano Province

Shinano Province

or is an old province of Japan that is now present day Nagano Prefecture.Shinano bordered on Echigo, Etchū, Hida, Kai, Kōzuke, Mikawa, Mino, Musashi, Suruga, and Tōtōmi Provinces...

. It is named for its tail, which is like a pipe cut in half. It can be tamed and kept in a pocket or sleeve, and uses its supernatural power to seek out assorted information which it then whispers to its master. A person who keeps it is thus able to see into both the past and future.