mounds built in open fields

Asked December 16, 2015, 2:59 PM EST

I keep finding mound up to 2 feet high and 1 to 2 feet in diameter built in my open field. There is no hole nearby and they can appear in 1 to 2 days. they are still covered with the weeds that were originally growing there. What builds these. I tried to take a picture but you can't really see mound.

Montcalm County Michigan

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