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| | The Natural History of Hampstead Heath |
 | | The higher parts of Hampstead town and all of Sandy Heath and West Heath are an outcrop, up to 25m thick, of Bagshot Sands, rare so near London. |
 | | One of the Hampstead Heath Conservation Unit’s main tasks has been to restore the West Field Bog, a S.S.S.I. Encroaching birches have been removed, dams made to increase the saturated area and the site fenced to help re-establishment, protect the sphagnum moss and encourage bog plants to grow again. |
 | | Hampstead Heath offers a diverse range of habitats attractive to many birds such as sparrows, starlings, kestrels, nuthatches, tawny owls and woodpeckers, and small mammals, including voles, water rats, weasels, grass snakes, slow worms, badgers and hares. |
| www.es.ucl.ac.uk /schools/Heath/natural_history.htm (378 words) |
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