flock of male and female mallard duck birds and mute swans on water during a winter period

anas animal avian beak biebrza biebrzanski bill bird birdie color colorful conservation crowd crowded cygnus duck flock fly flying green group herd kaczka krzyzowka labedz living mallard many marsh marshes moor multiple mute natural nature niemy numerous olor outdoor pack platyrhynchos poland reserve swamp swamps swan tail tourism travel wetland wetlands wild wildlife wing wings