英文關鍵字
adult
baby
barn
beak
bird
building
country
countryside
cup
deeply
farmhouse
feather
feed
feeding
fledgling
flight
fly
forked
habitat
hirundo
house
hungry
long
martin
martlet
migrant
mother
nest
nesting
nestling
plank
plumage
roof
rustic
rustica
songbird
spring
swallow
tail
under
underpart
upperpart
village
wild
wildlife
wing
wingspan
wood
wooden