英文關鍵字
air
animal
aves
background
beaked
beautiful
bird
birds
black
blue
bunch
characterised
class
closeup
cloud
constituting
doves
eggs
feathers
flight
flock
fly
flying
footage
formation
four-chambered
freedom
group
hard-shelled
heart
herd
high
jaws
laying
lightweight
metabolic
migration
movement
nature
outdoor
outdoors
pattern
pigeons
portrait
rate
ravens
roof
rook
separated
silhouette
skeleton
sky
strong
swirl
toothless
vertebrates
video
warm-blooded
water
white
wild
wildlife
wind
wing
wings