If you find sick or injured wildlife and cannot bring it to Tufts Wildlife Clinic, then you need to get the animal to a licensed Wildlife Rehabilitator. Rehabilitators are located all over the state of Massachusetts and you can find a map of them to locate the one closest to you by visiting the MassWildlife Rehabilitators Map. In many cases, you will have to leave a message. If you do not receive a call back within several hours (or by the next morning if you call after 6PM), try contacting a different wildlife rehabilitator for advice.
You can find a list of local wildlife rehabilitators in your area by visiting the Massachusetts Fish and Wildlife website.