alone
animal
ape
away
bars
behind
brown
cage
captive
captivity
chimpanzee
depressed
depression
despair
emotions
endangered
expression
expressive
eyes
face
fence
freedom
gorilla
hair
hope
jail
locked
loneliness
lonely
looking
mammal
mesh
metal
monkey
natural
nature
primate
prison
prisoner
rights
sad
sadness
small
solitude
thoughtful
trapped
wild
wildlife
wire
zoo