Strange holes in lawn this morning

Strange holes in lawn this morning

Observation - Strange holes in lawn this morning. Description: Strange marks dug into neighbour's lawn. Although we have grey squirrels, there has been nothing like this in the tens of years that the occupier has been there. Holes are approximately 1.5 inches deep, there has been scrabbling along edge of lawn such as

Strange marks dug into neighbour's lawn. Although we have grey squirrels, there has been nothing like this in the tens of years that the occupier has been there. Holes are approximately 1.5 inches deep, there has been scrabbling along edge of lawn such as Blackbird might do to look for insects. We know foxes have been seen around over the past few years, wondering if this is symptomatic of such a mammal looking for insects / worms etc. There are also small (< 1 inch sized frogs in the edge of the lawn.