These are pictures of squirrels I found around my house. They are limiting factors because they limit the amount of nuts that are buried. Seeds are buried by the squirrel and dug up as they are needed. If the squirrel doesn't dig up a nut, that seed will root and grow. The tree in the above picture is a limiting factor because it limits the number of squirrels that can use it as a shelter.
Special thanks to my mother and sister for alerting me to the squirrels.
