red knot (calidris canutus) spotted off bull island, dublin, often found along coasts

red knot calidris canutus shorebird coastal bird migratory birdwatching bull island dublin nature wildlife invertebrate feeding migration wetland habitat sea ireland shore wader sand route endangered species watching environmental conservation seabird ocean outdoor mudflat shorebirds birding reserve sandpiper loss preservation animal behavior beach sandbar ecosystem wetlands invertebrates protection