英文關鍵字
anas
anatidae
and
animalia
anseriformes
aves
bug
chordata
class
clean
cold
day
dive
drake
dry
ducks
family
feathers
female
females
flap
genus
ice
icehole
kingdom
males
mallard
near
open
order
phylum
platyrhynchos
prettify
river
scrutinizes
sedge
situation
southern
stand
sunny
swim
their
water
wild
wings
winter
wintering