Zoo: fun fact you do not need to double sign O instead move it forward
Lion: pull your hand back like its a mane
Tiger: showing tigers have stripes
Gorilla: pretending to pound the chest
Monkey: this is just a fun sign
Giraffe: U shaped hand showing a long neck
Zebra: repeat the action twice
Hippo: open hands far enough away that it shows how large a hippos mouth is.
Elephant: start at the nose and move in a wave motion to represent the trunk.