英文關鍵字
anas
anatidae
and
animal
animalia
anseriformes
aves
background
beak
birds
chordata
class
clean
cold
day
dive
drake
ducks
family
feathers
females
flap
flock
fly
fro
genus
harsh
ice
kingdom
lake
leisure
life
live
males
mallard
mallards
migratory
nature
open
order
outdoor
park
phylum
platyrhynchos
pond
prettify
quack
river
scurry
season
sunny
swim
unfrozen
water
waterfowl
wild
wildlife
wings
winter
wintering
yellow