Anastomus

Anastomus is a small genus of wading birds in the stork family Ciconiidae. It comprises two living species commonly known as openbills: the Asian openbill (Anastomus oscitans) and the African openbill (Anastomus lamelligerus). Members of this genus are medium-sized, with dark or glossy plumage and relatively long bills. They are especially noted for the distinctive structure of their bills, which assists in extracting molluscs from shells in aquatic habitats.

The Asian openbill ranges across the Indian subcontinent and Southeast Asia, while the African openbill is found in sub-Saharan Africa. Both species inhabit wetlands, including marshes, riverbanks, and flooded fields, where they feed largely on molluscs such as freshwater snails, supplemented by crustaceans, insects, and small fish.

Behaviorally, Anastomus species are typically seen foraging in shallow water, often in pairs or small groups, and sometimes joining larger flocks outside the breeding season. They build large, stick-nest platforms high in trees or shrubs near water, where both parents participate in incubation and raising the young. The species are resident or nomadic depending on rainfall and water availability.

Conservation status varies locally with habitat loss and wetland drainage affecting some populations, but the genus as a whole is not widely regarded as endangered. Where suitable wetlands persist, Anastomus storks can remain relatively common in parts of their ranges.