This is a fun little mechanical gadget. I think it is called a fast return actuator. Turn the crank clockwise and the bird swings back and forth with a very satisfying pecking motion. I made something similar out of wood years ago, pretty fun to be able to draw it in sketchup and print it out.
Print one of each part. I print the stand, washers and bird using raftless printing configured basically how they describe on the makerbot wiki (http://wiki.makerbot.com/thingomatic-doc:raftless). The modifications I made are: 1) I changed the Object First Layer Feed Rate Infill Multiplier (ratio) to be 0.5 2) I change the Object First Layer Feed Rate Permieter Multiplier (ratio) to 0.5 3) I changed the Object First Layer Flow Rate Multiplier (ratio) to 0.9 4) I disabled the Outline feature and generally delete the lines of gCode that do the warm up extrusion.
I print the washers using a raft because I think the smooth finish it leaves on one side is nice. These are small enough that I think you could get away with printing them raftlessly.
The washers slide onto the shafts with a little pressure. The whole thing assembles for me with no extrenal parts.