Note that mouse survival depends on the landing. It's quite reasonable for a mouse to fear heights even if in the *typical* situation it won't be hurt. If a m

Note that mouse survival depends on the landing. It's quite reasonable for a mouse to fear heights even if in the *typical* situation it won't be hurt. If a mouse freely jumped down and was impaled 1 time in 1,000 that would be a very bad choice for the mouse. Also, a mouse who jumps down might find itself in a situation where it can't get home.