Squirrels are rodents. Their poop looks like mouse or rat droppings, but bigger and with tapered ends. Their poop is shaped like very large grains of rice. If they're dehydrated, squirrel poop will be shaped like irregular little BBs. Squirrels need about a pound of food per week to sustain their lives. Anywhere they build a nest will have a significant amount of scat nearby. They usually come back to the same place to poop over and over, so you'll see piles of it in the corners of rooms if squirrels have infested it.