Hedgerow trees are important for so much wildlife. Over half of the priority BAP species associated with hedgerows are dependent, or partially dependent on, hedgerow trees. Bats for example roost in crevices and holes. Many birds make there home also in holes or in nests in the tree crown and often use trees as song posts. Lichens grow on the stem and many insects require some of our native species as part of their life cycle. Oaks for example has many hundred insects living on them.