Mysterious Holes

The last 2 mornings I have woke up to a pile of soil in my garden. The pile is next to a patio area and stones. We think the soil may have been pushed out from under the patio. Could anyone help identify which creature may be responsible for this and how we could stop it. If it helps our house backs onto a wooded area. I am also attaching an image of the soil pile.

Thanks in advance for any help 

Last edited: 02 September 2017 10:31:38