animals

anxious

around

beast

behind

border

boundary

brute

cage

cell

couple

danger

dangerous

day

disquieting

ecology

enclosure

fence

fidgety

gray

grey

grid

iron

jail

kennel

lock

mammal

mesh

metal

people

pet

predator

prison

real

restless

restricted

run

running

sadness

security

slavery

steel

the

troubled

uneasy

view

waiting

wild

wildlife

winter

wolf

wolves

worrisome