The current automata project has a large Bass lurking under the dock where a boy is fishing. He will periodically poke out his head and as he does his mouth will close and eyes will roll. Large is relative of course, he is just over 4" long.
The little block on his chin is to limit how far his mouth falls open and has been cut down substantially so it is not noticeable. There are two cables that operate the eyes and mouth. One of them (for the eyes) can be seen in the photo near the bottom rear.
The actuator for the eyes had to be assembled in the fish as it was made. As shown below the blank was sliced in half horizontally and a brass lever, weighted with solder was installed. The eyes are drilled out dowels slipped onto brass pins and were shaped into eyes after reassembly of the body and final carving. There are small brass tubes through the rear of the fish so the cables operate smoothly.
Three fins are made from 1/16" ply and added later. The two dorsal fins can be easily seen above. There are still two pectoral fins to be added when the above photo was taken. I'll repost after he is painted.
Automata is a creative blend of my life interests , engineering, art and woodworking.