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
morning
tranquility
flying
season
animal
blue
cloud
ecology
slow
motion
overcloud
cross
flock
aerial
black
becloud
environment
abstract
swallows