First question that comes to mind. How many critters have made this their home over the decades?
Next did it stay dry? The balsa may have a patina from age but it shouldn't be really dark or gray.
If the stab is twisted then it may have got damp and you would need to check the fuselage and wing for twists and turns.
If it is clean and the fuselage and wing are straight then it might be worth the time to recover and make a new stab . Pics would really help to determine what model it is and if it's worth it .
As far as the electronics, I wouldn't trust them even if the animals didn't use it as their toilet. The servos and receiver could be outdated and not work with today's or even yesterday's radios. Again pictures would help showing the inside and the electronics.