Marabou stork was moved into the genus "Leptoptilos" and the ending was modified to "crumeniferus" and used by many authors until it was noted that the correct masculine ending to match the genus is "crumenifer". The marabou stork is a massive bird: large specimens are thought to reach a height of and a weight of . A wingspan of was accepted by Fisher and Peterson, who ranked the species as having the largest wing-spread of any living bird. Even higher measurements of up to have been reported, although no measurement over has been verified. It is often credited with the largest spread
What Bird is That? all-time best seller in Australian natural history and is still in print today. While sales and stature of Cayley’s original collection continued to grow, the prolific artist and ornothologist Cayley was working on a much more ambitious project – his so-called “big bird book”. From about 1918, he was creating illustrations of subspecies, plumage stages and eggs (now lost) of all known Australian birds. The project was incomplete at the time of his death in 1950, although the illustrations were all but finished. The ornithologist Terence Lindsey revived Cayley’s plans in the 1980s, creating the last and most significant revision