Sand piper shore birds foraging for food at Elkhorn Sloughs in Moss Landing Harbor, California

bird nature reserve sea birds marine animals wild wildlife foraging digging wetlands elkhorn slough natural habitat ecosystem behaviours diet conservation monterey monterey bay watsonville castroville california central coast bird watching protected species long legged muddy substrate tidal estuaries mud flats shore features skinny legs small head environment movement research coastal pacific coast discovery seaweed short billed non breeding shore birds sand piper tides rocks