It is also maybe one of the world's longest-residing birds, with a noted lifespan of up to 100 many years. It is the world's only flightless parrot, the world's heaviest parrot, and also is nocturnal, herbivorous, visibly sexually dimorphic in overall body sizing, has a reduced basal metabolic level, and does not have male parental care. It is capable to survive effortlessly on quite small or on very very low high quality foods sources.