slavonian grebe nest

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