英文關鍵字
adult
ball
bird
birds
blue
bluetits
box
bred
breed
common
easily
eurasian
europe
family
fat
fed
feeder
feeding
fledge
fledged
fledgling
food
garden
great
ground
house
insect
paridae
passerine
plumage
recognisable
seed
size
small
species
support
tit
urban
widespread
yellow
young