Sort of related....
a few years I did some work for a large pest-control company that were investigating new tech for rat & mice elimination.
They were working on a plastic trap which, when the rodent entered, it would shut a door behind it, then release a co2 gas cylinder to suffocate it (otherwise it would eat its way out), then send a radio signal.
The idea was it would save the time taken for people to come out and check the traps, they could monitor it all remotely.
Another benfit was they didn't need any toxic bait, so didn't need to worry about accidentally poisoning anything too big for the trap, or poison getting washed out
Not sure if it ever went into production (or the radio-equipped toilet roll holders we did at the same time...)