英文關鍵字
wildlife
fly
flight
day
nature
outdoor
freedom
background
swallow
birds
sky
twilight
light
migration
swarming
herd
pattern
population
wings
ornithology
panning
forage
weather
air
behavior
bevy
birdwatched
change
chaos
climate
environment
morning
flying
ecology
season
blue
becloud
black
slow
motion
cloud
abstract
animal
overcloud
flock
tranquility
swallows
aerial
cross