See English Nature’s Health and Safety Information Notices 11/97 Visiting Working Mines and 12/97 Visiting Disused Mines. 2.5 Safety at tree roosts Many tree roosts are in trees that would be classified by an arboriculturalist as hazardous because bats tend to use old trees, which have developed hollow limbs, rot holes in the trunk or loose bark. If you wish to examine such trees using a ladder, follow the ladder code and place the ladder against sound trunk wood, never against a branch. Tie the ladder to the tree by means of a rope or strop. When checking or erecting bat boxes observe the following guidelines: • wear a safety helmet; • do not carry loose tools in the hand – put the tools you require in a haversack with a shoulder strap; • wrapping apiece of cloth or rubber tube around the top rung will help prevent the ladder slipping on the narrower tree trunks; • make sure you have an assistant firmly holding the ladder at the base; • ensure the assistant at the base of the ladder wears a safety helmet too; • do not climb trees without the help of a ladder – tree climbing requires special training.