The Cape Cod Stranding Network (CCSN) is dedicated to responding to these strandings. They attempt to release healthy animals back to the water, provide medical attention for sick & injured animals, work to prevent mass strandings, facilitate animal rehabilitation where appropriate, and humanely euthanize animals unlikely to survive.
Note : the CCSN has merged with the International Fund for Animal Welfare (IFAW). They have a continuous need for volunteers and donations. Go to http://blog.ifaw.org/category/strandings/ for more information.