As trees are living organisms they are constantly growing and changing. Therefore, because of their sheer size and weight some trees may require particular attention. Caring for trees includes regular checks, selective pruning and occasionally they require removing and replacing. This work is carried out by experienced qualified people who have often spent many years working in this field and as a result have a distinct empathy with tree growth and how best they should be managed. The safety of the general public is a primary concern, as trees in public places are those under most scrutiny and therefore require particular attention.