I haven't seen anything like that, but I probably haven't seen all the signs. I think this one may be linked to the Explorer's leaflet that children are given. They have to find the answers to the questions from signs and other clues around the exhibits.
That said, I think that if the anoas got themselves a good solicitor, they could sue for libel
In the last line of the text it says they are thought to come out of the Forest at night and puncture cattle with their sharp horns, so presumably its a local superstition.
I wonder whether, despite their small size, Anoa are ever dangerous in the wild if surprised at close range. A number of seemingly innocuous/placid species in captivity are quite the reverse in the wild, buffalo being one example.
