single rook bird on a tree branch during a spring nesting period

alone animal avian beak biebrza biebrzanski bill bird birdie black branch bush color colorful conservation corvus dangerous dark during fly flying forest frugilegus gawron green krukowate living marsh marshes moor natural nature nesting northeastern one outdoor period poland portrait reserve rook single spring swamp swamps tail tourism travel tree wetland wetlands wild wildlife wing wings wood wooded