Gazu Hyakki Yagyō
In the collection of depictions, the "Gazu Hyakki Yagyō" by Sekien Toriyama, they were depicted under the title 鼬, but they were read not as ""itachi", but rather as "ten"", and "ten" were considered to be weasels that have reached one hundred years of age and became yōkai that possessed supernatural powers. Another theory is that when weasels reach several hundred years of age, they become "mujina" (Japanese badgers).