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Genus Leptoptilos
Marabou Stork - A massive bird, large specimens are thought to reach a height of 150 cm , a weight of over 9 kg and have a wingspan of at least 3.5 m . In the last regard, it shares the distinction of having the largest wingspan of any landbird with the Andean Condor. More typically, these birds measure 120–140 cm , 310–350 cm across the wings, and weigh 6–10.5 kg . Unlike most storks, the three Leptoptilos species fly with the neck retracted like a heron.
Greater Adjutant - The Greater Adjutant is a large wading bird in the stork family Ciconiidae. It formerly bred in southern Asia, mainly in India, extending east to Borneo, but is now restricted to two small breeding populations; mainly in Assam and Cambodia. Populations disperse widely after the breeding season. This large stork has a massive wedge-shaped bill, a bare head and a distinctive bare neck pouch. During the day, they soar in thermals along with vultures with whom they share the habit of scavenging. Although mainly feeding on carrion and offal, they will sometimes prey on vertebrates. They are named for the stiff "military" gait when walking on the ground. Large numbers once lived across Asia but have declined to the point of being endangered. The total population in 2008 was estimated at around a thousand. In the 19th Century, they were especially common in the city of Calcutta, where they were referred to as the "Calcutta Adjutant", valued for their service as scavengers and used in the logo of the city municipal c
Lesser Adjutant - This is a huge bird, typically 110-120 cm tall, weighing about 5 kg and has a 210 cm wingspan. It is, however, the smallest member of the Leptoptilos genus. Its upper body and wings are black, but the belly and undertail are white. The head and neck are bare like those of a vulture. The pale bill is long and thick. Juveniles are a duller version of the adult.