This is like bowing to the queen and a sign of respect You can smile at a gorilla but try not to show a lot of teeth and if you nod your head while smiling a zoo gorilla will know you are trying to be polite. A gorilla is not a type of monkey. It is actually like us humans. Have you ever seen the movie Mighty Joe Young or King Kong. That is an exaggeration of a gorilla.
Gorillas never get that big.
Gorillas can not swim or climb trees because they are too big and heavy. Gorillas walk on the ground with their knuckles on the ground and their fingers clenched to their fist. Most of a gorilla's diet is a lot of rough stringy plants. Gorillas have a very similar yawn to humans. They can also shed tears and burp, hiccup and cough.