The timber rattlesnake, massasauga rattlesnake, and the copperhead are venomous snakes in New York. Do not try to touch a snake, and keep a good distance from venomous snakes. 

-obvious blood or wounds

-unable to move

-issues with their scales

-discharge from the eyes, nose, or mouth

-swelling

-lethargic

-other general signs of injury and illness

If the snake has been attacked by an animal, looks injured near a road, or shows any of the signs of injury and illness, contact a wildlife rehabilitator.