pile of leaves and twigs

pile of leaves and twigs

Observation - pile of leaves and twigs. Description: This pile of twigs and leaves appeared at the bottom of my garden yesterday. It's about 12 inches round and 6 inches high. Any ideas who made it and why?

This pile of twigs and leaves appeared at the bottom of my garden yesterday. It's about 12 inches round and 6 inches high. Any ideas who made it and why?