英文關鍵字
america
american
animal
baby
bison
buffalo
bull
calf
cow
crossing
eat
eating
family
feeding
grass
grassland
graze
grazing
group
habitat
herbivorous
herd
horns
landscape
mammal
meadow
mountain
national
nature
park
relax
reserve
rest
river
summer
tourism
tourist
travel
usa
visitors
water
wild
wilderness
wildlife
yellowstone