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4 chambered heart
spectacular
plumage
preening
preening gland
primary
regal
resident
royal protection since 1387
secondary
soft
swan
ornithology
territorial
up-ending
uropygial gland
vertebrate
waddling
warm blooded
water resistant
waterbird
webbed feet
white
pen
olfactory
anseriformes
dipping
aquatic
aves
behaviour
bird
birdwatching
cob
collective noun
contour feathers
cygnet
cygnus olor
down
oils
elegant
environment
feathers
habitat
keratin
lead poisoning
living dinosaur
monogamous
mute swan
non-passerine
wildfowl
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