英文關鍵字
agility
animal
avian
beak
bird
breed
brood
care
caught
chick
common
countryside
delichon
eggs
environment
europe
european
face
fleetness
flight
flyer
flying
forehead
forked
hirundinidae
house
hunter
insect
insectivorous
italy
martin
migratory
mud
natural
nature
nest
nimble
northern
ornithologist
ornithology
parental
passerine
plumage
red
rufous
small
songbird
swallow
tail
terni
umbria
urbicum
widespread
wild
wildlife
wings
zoology