Without careful management, the grassland would revert to woodland and so these areas of the hill are grazed in order to prevent scrub from becoming overestablished. Both the National Trust and Surrey Wildlife Trust use Belted Galloway cattle (affectionately nicknamed 'Belties'), which crop the grass less hard than other grazers and allow the more delicate wild flowers (including orchids) to flourish. At Betchworth Quarry, Surrey Wildlife Trust allows goats to graze, which can eat woodier plants such as gorse and bramble. Rabbits also make a significant contribution to the control of scrub and coarse grasses on the hill, although their numbers have declined since the introduction of myxomatosis in 1953.