great-crested grebe nest

eutrophied lake reed beds mace bird nest guide grebe egg ornithology nesting birds birding tour dabchick diver colymbus podiceps greatcrested cristatus closeup feather fowl hunting moorfowl skein stinkpot varmint waders water environment waterbirds waterfowl wild nature wildlife loculus locule hollow nestle altricial nidicolous nidology study nidification reproduction common phragmites australis mares tail hippuris vulgaris