The waders (or Charadrii) are typical shorebirds, most of which feed by probing in the mud or picking items off the surface in both coastal and freshwater environments.
The suborder Lari includes the gulls and their allies. These are generally larger species which take fish from the sea. Several gulls and skuas will also take food items from beaches, or rob smaller species, and some have become adapted to inland environments.
The auks (or Alcae) are coastal species which nest on sea cliffs and "fly" underwater to catch fish.