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Thanks for all of the interesting replies. Mallyh, that is exactly what I was worried about. Dr F, thanks for the links. The hole in my garden has an entrance and an exit as well and it definitely isn't a tunnel into next door's garden because I have had a look at the other side. I don't think there are cubs involved as the hole has only just appeared and it's too late in the year for that. Foxes have always loved my garden. Sometimes I put the security light on and see one sleeping under a bush or in the middle of the lawn under the crab apple tree. I just wish it wouldn't dig right in front of the garden shed because I can't get the door open due to the pile of soil.