“The Lesser Adjutant (Leptoptilos javanicus) stalks around wetlands feeding mainly on fish, frogs, reptiles and large invertebrates. They rarely feed on carrion. They may also take small birds and rodents particularly during the breeding season. They are solitary except during the breeding season when they form loose colonies.... They are silent but have been noted to clatter their bill, hiss and moan at the nest.” (Wikipedia)