Hoatzin (Opisthocomus hoazin) favor the leaves of giant arum; both are acclimated to a riparian habitat. The plant itself grows to ~ ft & typically can grow to a massive 8 ft tall & the leaves can be as big as 13 ft.
Royal Botanic Garden Edinburgh :: :: Amorphophallus Titanum's Corm, Weighing for Guiness Book of Records Aug 2010 - Record breaker! - the corm weighs in at a record. The previous largest recorded weight was