The most famous dinosaur is Tyrannosaurus Rex - a large lizard with tiny hands. However, if you think of a bat, it has very fragile finger bones (that would create the bone structure of its wings) and ends every finger with a claw. If the bones decay and/or petrify, they will most probably destroy the fragile finger structure, leaving the nails alone. That suggests that Tyrannosaurus Rex was more like a winged dragon, than a tiny hand giant lizard...

This is the funniest thing I read all week. Thanks.