lush meadows formed by colony of sea birds

abundance best bird birdlime birds cereals chicken chinchas colony dense droppings dung ecosystem excreta feces fertilized fertilizer fertilizers field fish fortified fowl grass grassland guano herb herbage hill landscape lime lush manure manured meadow meadows natural nitrogen nitrogenous north ornithogenic ornitogenic poultry rookery sea seabirds slope thick tundra tussock weed