Storks, herons, cranes, small waders, waterfowl, and also raptors visit the seasonal lakes. The Walmsley sanctuary is nationally important for wintering waders and wildfowl. Sandpipers are a large family, Scolopacidae, of waders or shorebirds. Seabird migration is similar in pattern to those of the waders and waterfowl. The lagoon is home to waterfowl, herons, and a variety of waders. Skuas are related to gulls, waders, auks, and skimmers. Some birds of prey specialize on migrating waders. It is a migratory stop-off point for thousands of ducks, geese, swans and waders. Significant populations of waders and mangrove birds are also present. Large numbers of migrant birds pass through Japan in spring and autumn including many waders. In flight, the fast, twisting flocks resemble waders. Hence pakicetids were most likely aquatic waders. The crab-plover is related to the waders. They have short legs and long wings and are herbivorous waders. The oystercatcher is one of the largest waders in the region.