It is a recognised pathogen and cause of morbidity in the Asian openbill ("Anastomus oscitans"). If monsoon starts early, the Asian openbill comes early. The African openbill feeds almostly exclusively on aquatic snails and freshwater mussels. The type species was subsequently designated as the Asian openbill ("Anastomus oscitans"). The African openbill is mainly resident and non-migratory; however, it may undertake nomadic movements. The African openbill ("Anastomus lamelligerus") is a species of stork in the family Ciconiidae. Bengal florican, black-necked stork, mallard, openbill stork, teal, whistling duck and many others. Darter, Asian openbill, painted stork, Eurasian coot and black-crowned night heron. Asian openbill storks generally start nesting during mid-June, though the migration depends upon the rain.