If you're like me, you may mostly recognize kākāpō from a video that has gone viral a few times of one attempting to mate with a documentary cameraman's head: https://www.youtube.com/watch?v=9T1vfsHYiKY
The documentary linked in that clip is called “Last Chance to See” and is an outgrowth of an earlier collaboration between Adams and the BBC, which also included a book by Adams that I highly recommend. The Kakapo is a prominent character.
“Ah, that’s why.”