just-monsters: 鐙口 (あぶみくち) or Abumi-kuchi = (Stirrup Mouth) A strange furry creature formed from a...

just-monsters:

鐙口 (あぶみくち) or Abumi-kuchi = (Stirrup Mouth)

A strange furry creature formed from a stirrup, illustrated in the Gazu Hyakki Tsurezure Bukuro. The accompanying poem suggests that it once belonged to a man who has fallen in battle, and now shares in his misfortune:

膝の口をのぶかにいさせてあぶみを越して 
おりたゝんとすれども、なんぎの手なればと、 
おなじくうたふと、夢心におぼへぬ。 

translation: An arrow is shot deep into the knee, and he falls from his stirrups, and the hand of suffering is dealt, and such a song is sung, I saw it not in my dreaming mind. 

Citations 
1. Murakami 2005 p. 17 
2. Inada p. 287

information from obakemono.com