great crested grebe (podiceps cristatus) brooding his nest on a river

crest life biology float feather cute animal wildlife bird ecology aquatic water habitat zoology environment nature wild wilderness spring ecosystem avian fauna nesting beak lake nest river ornithology birding waterfowl birdwatching waterbird ornithologie great crested grebe podiceps cristatus brooding two eggs bas-rhin collectivite europeenne d'alsace grand est france