What kind of animal did this?

Most of the area has been smoothed out by my foot. But there s a mound (which I can't load a second photo) which is an oblong hill about a quart of soil and no hole that I can see nearby.
My concern is rats but I don't want to harm any other animals--maybe even allies!
Update: I forgot. The hole shows up in one night and leads nowhere. I am worried about a van parked nearby in case it is rats.
Update 2: That hole is 2" diameter.
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