adult
animal
aquatic
atra
beautiful
bird
birdwatching
black
cold
colony
colorful
common
coot
danube
dark
december
delta
eurasian
european
family
fauna
flock
foraging
formation
frost
frozen
fulica
group
habitat
ice
icy
lake
many
migration
migratory
natural
nature
ornithology
outdoor
peace
plumage
reflection
river
row
seasonal
together
water
wild
wildlife
winter