there are 40 local nature reserves in somerset recognised by natural england. the smallest is wellington basins, which covers of small ponds and surrounding grassland and woodland. this provides a habitat for grey wagtail, dipper and reed bunting. the largest, covering , is weston woods on worlebury hill, which includes worlebury camp iron age hill fort. the woodland provides a habitat for mammals including deer, badgers, foxes and bats. birds include woodpeckers, buzzards and treecreepers. several of the sites are sites of special scientific interest (sssi). the list includes sites owned or managed by both avon wildlife trust and somerset wildlife trust.