In manga/anime, why are physically strong girls called "gorilla"?
The characters are often small and/or slender so they don't look like gorillas at all, they're just strong. And this label is usually only applied to girls, not to women or men, unless the man actually looks like a gorila I suppose.
And why gorilla instead of any other animal?
Is there any cultural basis for this? Usually the person called that is offended so maybe it's not often said in real life but who knows....
Or even if it's fiction what's the history? It seems everyone just agree on the same term.