Several abandoned brick and concrete structures provide habitats for bats and grills have been placed over their entrances to protect the roosting sites. Three species are known to inhabit the old Box Hill Fort: the brown long-eared bat, the noctule bat and Natterer's bat. The brown long-eared bat, Natterer's bat, the whiskered bat and Daubenton's bat have been recorded at both Betchworth and Brockham quarries. Brandt's bat has been recorded at Betchworth; Bechstein's bat and the common pipistrelle have been recorded at Brockham.