animal
animals
avian
biodiversity
bird
birds
color
colors
colour
common swan
common swans
couple
cygnus cygnus
eat
eating
fauna
feed
feeding
fog
hokkaido
japan
kushiro
kushiro river
look for
looking for
mist
natural
nature
ornithology
pair
river
rivers
search for
searching for
species
swan
swans
two
vertebrate
vertebrates
water
waterbird
waterbirds
wetland
wetlands
whooper swan
whooper swans
wild
wildlife
zoology