The good news is that he’s really careful with his toys. It’s rare that he destroys one, and even then it’s more from wear and tear, not outright shredding it like many dogs. So the fish might still work!
Yeah. These are actually lithium rechargeable too. There is a molded housing and built in servo with like 20% range on a small arm that goes in the tail. I haven’t taken one apart but it is triggered off of impact like I would expect from a spring tilt/impact switch, though it could be some kind of MEMS chip.
No clue where they came from. This monster can’t stand them, or anything that makes noise. The kitten loves them, which is awesome if I ever get around to making some cat toys with servo motors again.