英文關鍵字
amazing
animal
avian
background
beak
beautiful
beauty
bird
black
blacknecked
close
color
cygnus
elegant
environment
exterior
fauna
feather
graceful
lake
landscape
many
melancoryphus
melanocoryphus
natural
nature
neck
necked
ornithology
outdoor
outside
peaceful
plumage
pond
portrait
profile
reflection
river
ruddy
shelduck
shelducks
summer
surface
swan
swim
swimming
view
water
waterfowl
white
wild
wildlife
with
zoology