英文關鍵字
aggression
agression
animal
avian
background
beak
bird
birdhouse
birds
blackbird
branch
common
competition
environment
european
feather
feathers
feed
feeder
feeding
food
garden
home
house
hungry
isolated
nature
nest
ornithology
perched
plumage
season
songbird
sparrow
speckled
spring
squabble
starling
starlings
sturnus
suet
thrush
tree
urban
vulgaris
wild
wildlife