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