There was a rat under my Contour's hood, once, but it crawled up from the ground.
I remember in the early-90's, the Ford plant in Hermosillo Mexico (they made Escorts back then) had a black widow spider problem.. and the spidies where hiding in boxes and would scare the crap out of the employees when they were opened or such.
I wonder if someone will open up the glovebox on their 91 Tracer and find one jump out, that was living for the last 12 years on the wiring.