At that size, H. inexpectatus is about two-thirds the height of the average American woman and twice the size of the largest parrot currently living in New Zealand, the kea. The paleontologists couldn't tell much else about the bird—they had only leg bones to go on—so they weren't even able to place it fully on the phylogenetic tree. There are three genera of New Zealand parrots, and without some kind of genetic analysis, it's not clear exactly which this ancient behemoth falls under. Superficially, the researchers think it bears more similarities to the kakapo, the world's only flightless parrot, which also happens to be nocturnal. Keas are the other main extant group and are fairly giant in their own right. They too are nocturnal and are so large they've been known to kill sheep.