Provision or retention of forest strips in areas subject to timber extraction may be undertaken with the purported objectives of helping to mitigate the effects of loss of forest cover for woodland flora and fauna, as well as reducing potential problems such as soil erosion. Nature conservation aims include retaining valuable old forest features such as older trees with cavities and dead wood affording nest site and foraging opportunities for woodland birds. A similar intervention is ‘Ensure connectivity between habitat patches’, discussed in ‘Habitat protection’.