英文關鍵字
anas
anatidae
animal
animalia
aves
background
beak
birds
chordata
class
clean
cold
day
dive
diving
drake
ducks
family
feathers
females
flap
flock
genus
kingdom
lake
leisure
life
live
males
mallard
mass
migratory
nature
open
outdoor
park
phylum
platyrhynchos
pond
prettify
river
season
spring
sunny
swim
swimming
under
unfrozen
water
waterfowl
wild
wildlife
wings
wintering
yellow