single adult female mallard duck bird on a tree branch over the biebrza river wetlands in poland in early spring nesting period

mallard duck anas platyrhynchos krzyzowka kaczka bird female poland polska biebrzanski biebrza forest wood wooded tree branch water pond river lake park color colorful travel tourism outdoor nature animal avian wing wings living wildlife wild wetland wetlands moor marsh marshes swamp swamps natural conservation bill beak tail one single alone adult over early spring nesting period