What's the word on this mask, which seems to have been seen in many anime?

This is "Firefly No Mori" in Akin, wearing such a fox mask

And Natsume Tomono account also has such a mask, in some Japanese artist's homoerotic works also have appeared in this mask

The majority of the juvenile anime pictures with fox masks are homoerotic works ......

Except for the monster-themed works, the modern sense of strong works in the temple fair and so on will have a mask, but generally rarely wear the plot ......

Japanese folklore fox, civet cats, bobcats and other animals will be transformed into human form to play tricks on human beings, wearing such a mask may be a prayer to obtain the power of such a