General characterisitics of kakapo bill.
Date 1888
Source A History of the Birds of New Zealand (http://www.nzetc.org/tm/scholarly/tei-BulBird-t1-g1-t1-front-d6-d6-d2.html)
Author Buller, W. L. A History of the Birds of New Zealand. 2nd ed. (London, 1888). page LXIX. Sir Walter Lawry Buller (1838–1906)
Source: https://commons.wikimedia.org/wiki/File:Bul01Birdlxixa.jpg

The kakapo (Strigops habroptilus), also called owl parrot and kākāpō or night parrot in Māori, is a species of large, flightless, nocturnal, ground-dwelling parrot of the family Strigopidae endemic to New Zealand. It is the world's only flightless parrot and the heaviest parrot.