Wolf snake: Introduced to Christmas Island from South East Asia
Creatures that have moved in from a far include the grey squirrel, rose-ringed parakeet and the noble false widow spider. The UK likewise has more settled outsider plants than somewhere else in Europe, for example, Himalayan balsam. Researchers say islands and terrain seaside districts are worldwide "hotspots" for alien species. They are calling for more successful measures to stop assist presentations of plants and creatures into vulnerable biological systems.