We are using small, solar-powered ultra-sonic devices anchored into the ground to chase away the moles at our study site Neustift, which are a real pest in particular in spring time. As you can see in the picture, it looks like that this year the moles have decided to strike back, taking revenge on an ultra-sonic device by burying it in a molehill. Looks like we need to consider other options to get rid of them …