https://en.wikipedia.org/wiki/Unicorn
Unicorns can also be bovids (goats).
Currently, unicorn implies equine, but this is not always correct... But I'm not even sure it should be unimplicated. I think it would do more harm than good, as an overwhelming majority of unicorns on this site are equines rather than bovids, and I don't think people are going to start tagging equine if they see a unicorn.
As far as I know, the image provided above is the only instance of a goat unicorn on this site... Is it worth it to leave it mistagged as equine, or should something else be done?