>>81559578 (OP)Because their jaws protrude forward like a chimp. Which in turn makes their mouth bigger.
They also have big, wide, double barrel shotgun, gorilla nostrils, and comically huge, inhuman looking fish lips.
They also have a low cranial roof, which creates a flat bean shaped head.
>Weird looking eyes. Either too much visible sclera, making their eyes look like they're popping out like a pug, or not enough sclera, giving them a monkey like appearance.