White bird guano decorates the black volcanic rock on the beach in Rocky Point, Mexico

rocky beach black volcanic rock marine environment rocky point puerto penasco shoreline beach shore pacific ocean gulf of california tide pacific saltwater ocean wading surface feeders habitat mexico sand seabirds guano pelecanidae covers feeding niches grey nature water birds gulls pelicans colonies black wildlife seagulls brown pelican roosting long beak glide birdlife decorates bird plumage exotic white catch prey fowl throat pouch perching birdwatching squadrons