英文關鍵字
agile
anatidae
animal
animals
beautiful
bird
birds
blue
brown
comparison
duck
ducks
environment
eurasian
europe
european
fast
fauna
female
frozen
ice
lake
mallard
mareca
modesty
motley
natural
nature
nimble
penelope
plumage
pond
prompt
quick
rarity
reflection
river
size
sizes
sky
small
spring
water
waterfowl
wigeon
wild
wildlife
winter