black tern chlidonias nigra, young

and backwater behavior bird birding birds black bog bulrush butomus cane chlidonias feeding fen flood flow flower flowering food gathers guide hag lake letch marshes mire morass morwennol moss nigra ooze oozes orn ornithology plains pond prevails purgatory quag quagmire reed rush sea seaswallow slough slump sterna study swallow swampland tarrock tern tour umbellatus wading wash wasteland watching wetland young