Arthur Rivett and Nick Gibbons checked out the Two Mile Bottom bat hibernation tunnel on 9th January 2009 and found three species of bat hibernating:
| Bat | A(West entrance section) | B(West chalk section) | C(North-west tunnel) | D(North east tunnel) | E(Kiln) | F(South) | Totals |
|---|---|---|---|---|---|---|---|
| Natterers | 6 | 0 | 0 | 0 | 1 | 0 | 7 |
| Brown l-eared | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| Daubenton | 21 | 4 | 8 | 0 | 4 | 0 | 37 |
| Brants | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
| Barbastelle | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
| Totals | 28 | 4 | 9 | 0 | 6 | 0 | 47 |