Star Trek: NSO – “The Fascinating Forcefield”

“Captain, although primitive, this forcefield is nontheless quite effective against larger pest species from the rodent family.”

Indeed, you are correct as usual, Spock. We call these “tree guards” and they do a good job at keeping hungry rabbits from nibbling the bark of fruit trees. Apparently, they are also quite effective in trapping Starfleet officers. Sorry about that!