On the substrates used for marking by the Stone Marten (Martes foina Erxl.) at the lowland areas of South Bulgaria

At the area investigated the solid materials situated up the ground slightly dominated over the marking just on the ground. The concrete materials were mainly used followed by the stones, and soil. Rare were the cases of marking on the herb vegetation. Occasional marking was observed on a dead grass snake Natrix natrix and nylon remains.