Dromadidae – Crab Plover

The Dromadidae (Crab-Plover), family is related to the waders, but sufficiently distinctive to merit its own family. The order Charadriiformes also includes Pluvianellidae (Magellanic Plover), Chionidae  (Sheathbills), Burhinidae (Thick-knees & Stone Curlews), Pluvianidae (Egyptian Plover), Recurvirostridae (Stilts & Avocets) Ibidorhynchidae (Ibisbill), Haematopodidae (Oystercatchers), Charadriidae (Plovers & Lapwings), Pedionomidae (Plains Wanderer), Thinocoridae (Seedsnipes), Rostratulidae (Painted Snipe), Jacanidae (Jacanas), Scolopacidae (Sandpipers), Turnicidae (Buttonquails), Glareolidae (Coursers & Pratincoles), Stercorariidae (Skuas), Alcidae (Auks) and Laridae (Gulls, Terns & Skimmers).

Crab Plover Dromas ardeola – ©Bird-Photo-Tours ASIA

The Dromadidae family relationship within the Charadriiformes is unclear, some have considered it to be closely related to the thick-knees, or the pratincoles, while others have considered it closer to the auks and gulls. It is the only member of the genus Dromas and is unique among waders in making use of ground warmth to aid incubation of the eggs.

Crab Plovers in flight – ©Bird-Photo-Tours ASIA

The Crab Plover resembles a plover, but has very long grey legs and a strong heavy black bill similar to a tern. Its black-and-white plumage and long-necked upright posture with heavy bill makes it distinctive and unmistakable. Its bill is unique among waders, and specialised for eating crabs. They also have partially webbed toes. The plumage is white except for black on its back and in the primary feathers of the wings. They are noisy birds, calling frequently on their breeding sites and in their wintering grounds. The usual call is a ‘ka’ similar to that of the Bar-tailed Godwit, but repeated rapidly. Flocks may produce a whinnying sound that rises and at in the breeding season produce whistling ‘kew-ki-ki’ notes.

©Bird-Photo-Tours ASIA

Males and females are not easily distinguished, but males have a heavier and longer bill. Juveniles have black on the mantle, are greyish and remain in this plumage for a year. Flocks fly in lines or ‘V’ formations. The Crab-plover is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

They are unusual for waders in that they nest in burrows in sandy banks. In the Red Sea region, the breeding season begins around the middle of May. It is a colonial breeder, nesting in colonies as large 1500 pairs. They lay one white egg, occasionally two, which are large for its body size. The nest burrow temperature is optimal due to solar radiation and the parents are able to leave the nest unattended for as long as 58 hours. The chicks are also unique for the usually nidifugous waders in being unable to walk and remain in the nest for several days after hatching, having food brought to them. Even once they fledge, they have a long period of parental care afterwards. Both males and females take care of the young.