Sadly, at this time of year people often come upon baby animals in need of rescue. The National Wildlife Rehabilitators Association has two handy little charts on their "Help! I've Found an Animal" page. You can find them here.
The best thing to do would be to contact an expert. A list of licensed New Hampshire wildlife rehabilitators can be found here.
In a pinch, you could borrow this manual from our collection--Wildlife Care for Birds and Mammals by Dale Carlson and Irene Ruth [639.96 CAR]. The Table of Contents contains the following:
I found a baby bird
I found a baby duck
I found a baby opossum
I found a baby rabbit
I found a baby raccoon
I found a baby squirrel
First aid for wildlife: basic care for birds and mammals.
You could also download Wildlife Care Basics for Veterinary Hospitals, a free manual from the Humane Society Veterinary Medical Association.
Photo by noricum.