As mentioned - mice on an aircraft are a big no no. They can chew through wires and their corrosive urine doesn't help the metalwork. That's apart from the hygiene issues.
There are so many strict rules regarding catering. That wouldn`t have happened in the UK or most outstations in this day and age. I do remember landing from the Seychelles about 20 years ago and a frog jumped out from behind a catering canister.