Just saw this. Seems poor Chook is no longer with us.

For those unfamiliar with a Lyre Bird, they mimic any sound they hear.
Chook was listening to construction work at the Adelaide Zoo.
From what I can tell, apart from the monkeys in the background, all the other sounds/ bird calls are from chook.

The name comes from the tail. Shaped like a lyre. You can see him fan it out. Also on the obverse of the Oz 10c coin.

Enjoy.

Margaret, my wife and I came across one in the Barrington Tops National Park about 20 years ago.
We first of all heard a chainsaw and thought that some rangers may be doing some maintenance then we heard it again very close to us (we were on an old logging trail walking), we very quietly had a search about and quickly saw him about 30 meters of in the bush and we just stood there as quietly as we could and listened to him for about 20 minutes. The predominant sound was the chainsaw but a kookaburra as Chook was doing and many other bird calls that we had heard from time to time elsewhere but could not identify and one that we just couldn't make out until later that night back at the camp we realized it was a diesel logging truck changing up gears. We later saw one of the rangers and commented on the Lyre bird and he told us that the first time they heard it they went looking for who was cutting firewood in the national park.
He also confirmed the truck changing gears and said that we were just inside the national park and over the ridge (100 metres) was state forest where chainsaws were being used and logging trucks collected the logs.

I'd like to hear one imitating a "K" doing 100 down the hwy 

amazing eh ?
have heard them imitating bell birds and whip birds as well ...many years ago now

very enjoyable , thanks Rossko.
after all that hammering and drilling , not much to show for his efforts, except a good laugh.