Any bat that can be approached is sick, and probably has rabies. Never touch a bat. Cover it with a trash can lid or similar until it can be disposed of. Oddly, squirrels are not a big source of rabies in this country. They typically either get away from a rabid attacker totally unscathed, or do not survive the attack.
Squirrels are susceptible though, so watch for the warning signs.
Include parent name if victim is a child. Location of the animal when the bite occurred and present location of animal. Whether or not the animal seemed to attack without provocation. The date of the animal's last rabies vaccine. If possible, confine the animal so that it may be picked up by authorities for 10 day quarantine and observation.