Kakapo the "booms" (see below for a recording) and "chings" of their mating calls, they will often loudly "skraark". The kakapo has a well-developed sense of smell, which complements its nocturnal lifestyle. It can distinguish between odours while foraging, a behaviour reported in only one other parrot species. The kakapo has a large olfactory bulb ratio (longest diameter of the olfactory bulb/longest diameter of the brain) indicating that it does, indeed, have a more developed sense of smell than other parrots. One of the most striking characteristics of the kakapo is its distinct musty-sweet odour. The smell often alerts predators to
Kakapo by 1976 the kakapo was gone from the valley floors and only a few males survived high on the most inaccessible parts of the cliffs. Before 1977, no expedition had been to Stewart Island/Rakiura to search for the bird. In 1977, sightings of kakapo were reported on Stewart Island. An expedition to the island found a track and bowl system on its first day; soon after, it located several dozen kakapo. The finding in an 8,000-hectare area of fire-modified scrubland and forest raised hope that the population would include females. The total population was estimated at 100 to 200 birds.