Human dispersal around the world has been accompanied by a range of other species that have established themselves outside the limits of their natural distribution. These invaders, non-native, exotic or alien species, are changing the natural world as these species, when once established, are very difficult to eradicate.

The transcript and downloadable versions of the lecture are available from the Gresham College website: http://www.gresham.ac.uk/lectures-and-events/unwelcome-guests-alien-animal-invaders

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