If a rat is on board a plane will it die if pilot climbs to a high altitude?
Depends. Most rats fly first class in my experience. Seriously,
it depends on the airplane and conditions. Commercial aircraft are
pressurized so pets and people can breathe. Most baggage
compartments are heated too. So if the rat is inside the airplane's
pressure shell it will be fine. A rat in the wheel wells or the
wings would not usually survive.