It IS a cute little critter - love the beak! I wonder why they are kept in the dark? I also wonder why human hands are all over them with no fear?
I'm not a specialist at all, but I do know that they're nocturnal, flightless birds that live in the underbrush and are extremely endangered (I heard them screaming to each other in the middle of the night while I was on a trek on the south island). NZ programs are breeding and releasing kiwi to try to get the pop. back up. Kiwi lay only one egg a year -- the hatchlings get virtually no protection or nurturing after birth from their parents, they're pretty much on their own (these evolved in the utter absence of any predators, notably mammals - the arrival of stoats and dogs and the like almost did them all in). The human breeders must pose no threat - they get the birds off to a strong start and release them.
The wikipedia article on kiwi is a nice intro. "The kiwi lays the biggest egg in proportion to its size of any bird in the world, so even though the kiwi is about the size of a domestic chicken, it is able to lay eggs that are about six times the size of a chicken's egg."