Master mechanical artist Tim Hunkin has created a giant automaton clock for the London Zoo. This amazingly complex kinetic sculpture is base on the theme of Victorian Era attitudes towards the animal kingdom.
The artist has a section of his site devoted to the London Zoo Tropical Aviary Clock. The pages show his photos and sketches (he's also known for his cartoons) of the automaton, rejected design ideas, technical aspects of the piece, and various other factors that influenced him along the way.
It is wealth of information, a fascinating look at one kinetic artist's creative process, and very entertaining. The video is a few minutes long, but only because the sequence of the automaton is so elaborate. Well worth it!
Here the page devoted to the London Zoo Tropical Aviary Clock. Here is the page about the design of the clock.