英文關鍵字
america
animal
bred
breed
breeding
bury
climb
control
danger
drey
eastern
eat
ecologically
environment
essential
fast
fed
feed
feeding
fight
food
forest
fur
genus
gray
grey
high
jump
keep
live
mammal
most
native
natural
nature
nimble
north
nut
nuts
peanuts
pest
prodigious
regenerator
rodent
safe
safety
sciurus
squirrel
store
tail
territorial
territory
tree
winter