In addition to the common 45 pipistrelle, a number of other mammals occur at Harelaw; Soprano pipistrelles, brown long-eared bats, wood & house mice, bank vole, pigmy and common shrew, brown rat, hedgehog, hare, weasel, stoat, red and roe deer. In the recent past Harelaw did have the occassional visit from a red squirrel, but following the felling of the coniferous plantation on the hill in 2007, only one has been seen. More alarmingly still the parapox virus carrying grey squirrels are close, and roadkilled individuals have been seen within 2 miles.