anatidae
animal
animals
band
bewick
bewick's
bewickii
bird
birds
britain
british
code
collar
collared
collars
columbianus
cygnus
europe
european
fauna
German
germany
great
Kingdom
lake
lakes
migrant
migrants
migrating
migration
migratory
nature
neck
netherlands
of
off
ornithology
passage
pond
research
route
schleswig-holstein
science
sciences
swan
swans
take
taking
tundra
uk
United
water
waterbird
waterbirds
waterfowl
waters
white
wildlife
winter
wintertime
yellow