Ventnor downs support a small herd of feral goats, introduced in 1993 to control the growth of holm oak trees, and managed by the National Trust. Although not native to the UK, holm oak was introduced from the Mediterranean; the Victorians planted it widely in Ventnor, which has the largest holm oak wood in Northern Europe. This is described in the Isle of Wight Biodiversity Action Plan as a remarkable and extensive area of recent secondary woodland, and is gradually becoming colonised by other Mediterranean species including large white helleborine, yellow birds nest, the large fungus Amanita ovoidea, and the oak rustic moth. The holm oak stabilises the land, but is invasive, its further spread limited by the goats.