I always wondered about folks leaving the galley hatch open.
I only opened mine when I was right there cooking. then closed it right away.
I learned the Silver Shadow galley really isn't big enough, so I just used the picnic tables at the parks to cook at.
I like to boon dock at a farm in Eastern Washington. The place is crawling with all sorts of rodents that like to get int cars and trailers. That attracts the rattle snakes into the aforementioned cars and trailers, so I never left any thing open for a second there.
Oh ya, I forgot. Congratulations on catching the mouse.