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Apparently Greater Spotted woodpeckers lay 5-6 eggs, and given that they will happily clear out a nest of tits, for example, in one sitting, they must have more than one chick to feed!
It looks like maybe a rabbit to me. If it is, you can apparently save hair from your hairbrush and place it near the burrow to help deter them. Otherwise I hope it's not rats. We lived next to a small farm once and had them suddenly appear in the winter due to the birdfeeders.
Not all architects are unhelpful to wildlife. I work as an ecological surveyor and much of my work is with a company that started as an architecture business but joins this with the ecological side, advising on and undertaking surveys for protected species as well as encouraging provision for wildlife, such as incorporating barn owl boxes and bat lofts into the design.