alone
animal
annoyed
ape
away
baby
bars
behind
black
brown
cage
captivity
captured
capuchin
chimpanzee
depression
despair
environment
environmental
exhibit
face
fence
funny
gorilla
hairy
hand
herbivore
hooded
iron
jail
locked
loneliness
mammal
metal
monkey
muzzle
natural
nature
primate
prison
sad
sadness
sentence
solitude
tame
term
trapped
wild
wildlife
zoo