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