A medium weight Hessian sack is used to extract the squirrels from the trap. If the sack is too thin there is a high risk of being bitten or scratched through the fabric, and if too heavy it will be difficult to control the movement of a squirrel inside. Polythene sacks have an open weave and are unsuitable. After first checking that there are no holes in it, the open end of the sack is placed around the trap exit door and the width of the sack rolled up to form a tunnel. The exit door is opened and captive squirrels are driven, one at a time, into the sack and the
exit door closed. When squirrels are reluctant to leave the trap, e.g. in poor light conditions, they can be encouraged to move into the sack by blowing on the base of their tail. The operator should position themselves so as not to deter the squirrel from entering the sack. The squirrel is then moved into the corner of the sack and with the head positioned carefully within the corner, killed rapidly and humanely by a single blow to the back of the head with a blunt instrument