Almost every morning I notice animal droppings on my lawn, around the same area, between the garage and the fence we share with our neighbors. They are of a dark Color, almost black. Also, a couple of times now, I would see a heap of dead grass, in the middle of the backyard, covering droppings which are lighter in color!!  As if the animal wanted to cover its dropping!! We have a rather large backyard, with only 2 trees and some shrubs on the side. We have no pets and neither any of our surrounding neighbors. There are a lot of squirrels in our subdivision, and man made lakes. Please help me identify these droppings. So far I have not seen any damage to the lawn, just the annoying sight of the droppings!! Thank you for your help.