英文關鍵字
animal
avian
beak
bird
bread
brown
calm
clean
day
drake
ducks
eat
environment
feather
feed
float
green
lake
level
male
mallards
nature
ornithology
plumage
pond
reflection
river
russia
sea
serene
shooting
shore
spring
summer
sunny
surface
swim
tranquil
water
waterfowl
wild
wildlife
wing