In my neighborhood, I have noticed that a significant number of squirrels come up with hurt hind legs, sometimes with the foot mangled as if it's been through a shredder. There's been 5 this summer alone. How is this happening to them? Is someone trying to trap them? Is it the outdoor cats around the neighborhood (I've seen one squirrel get snatched up by a cat while running to its tree)? Do they fight amongst each other to the point of inflicting such severe injury? Is there anything I can do for them besides providing food and fresh water? I don't like seeing them in pain and so vulnerable. Thank you.