thumb and toe claws are unhooked and not pulled. Often it is best to place the bat and net on a flat surface to achieve better control this applies particularly to larger bats, when it is necessary to avoid being bitten. 4.2 Cone trap This trap is used mostly for research projects where large numbers of bats must be caught. Bats can be damaged (for example by biting each other) and these traps should not be used when females are in late pregnancy. CHAPTER 4 C ATCHING BATS 42 The trap is simply a large cone made of plastic, nylon sheet or other suitable material, sometimes with a collecting bag at the narrow end. The open end is held in position over an exit hole and emerging bats slide down (Figure 4.4). Various sizes and shapes can be employed to suit individual roost sites and the method works best where the bats are emerging from a small hole, so it is not generally suitable for capturing horseshoe bats. This method is ideal for catching a large number of bats at a roost as quickly as possible. Captured bats should be quickly transferred to holding bags.