Matt Larsen-Daw, chief executive of The Mammal Society, says there can be a few reasons why moles might go through a phase of tunnelling later in the year.
But he said this happening even for a couple of consecutive years did not mean climate change was to blame.
“A mild year may mean that some females have a second litter in the autumn, especially if the first litter was early due to an early spring,” he said.
“This could mean that some young moles are establishing their tunnel system in a new territory in the winter.”
“Again, this could happen as a one-off, it is a rare occurrence – moles usually have one litter a year.
“But if climate change leads to the conditions that allow this being more frequent then it could become more common.”