英文關鍵字
action
america
animal
aquatic
avian
beak
beautiful
bird
birds
blue
brown
cold
color
douro
drake
duck
far
feather
feathers
female
flock
fly
flying
frost
game
group
hunting
ice
lake
mallard
moment
movement
nature
north
open
ornithology
pond
river
snow
takeoff
tree
water
waterfowl
white
wild
wildlife
wing
wings
winter