The original book, Last Chance to See, by Douglas Adams (of Hitchhiker's Guide fame) is absolutely excellent. Mark Cawardine, the guy in your video, was a co-traveler for the book too. I can't recommend it enough.

The kākāpō is a bird out of time. If you look one in its large, round, greeny-brown face, it has a look of serenely innocent incomprehension that makes you want to hug it and tell it that everything will be all right.

It seems that not only has the kākāpō forgotten how to fly, but it has forgotten that it has forgotten how to fly. Apparently a seriously worried kākāpō will sometimes run up a tree and jump out of it, whereupon it flies like a brick and lands in a graceless heap on the ground.

RIP Douglas Adams.