Bats have an average wingspan of about 8 inches and weigh about 2-3 lbs on average. They can navigate in total, even magical, darkness using their sonar and relay descriptions of such areas to their bonded spell caster. Their sonar also allows them to see through most illusions instantly. Bats also receive a +10 to their Stealth skill. Bats also grant their bonded spell caster a +4 bonus to all attempts to recognize and see through illusions.