It is alleged that this photo is a self-portrait, taken by a macaque, after the photographer left his camera unattended. Then websites reproduced the photo and a protest letter was sent, and there was discussion here and here as to who owned copyright, if any, in the photo (assuming there’s no human authorship).
This is what I think: I think macaques have fairly long canines (or fangs as I would call them). So this guy is either missing his fangs or there is at least a little human authorship to this photo.
And what about works created by robots?