In the United Kingdom new species of fauna have been introduced since Roman times and the number of species released or escaping into the countryside since 1900 has steadily increased. New species are filling in niches left by species extirpated by humans and these new species have, after 40+ years of observation created no problems.
Despite this the official policy of the UK Government and the Department for Environment Farming and Rural Affairs (DEFRA) is to class such species "invasive" and trap and kill them as the opportunity arises.
This paper suggests that DEFRA needs to reassess its stance since it is impossible to exterminate all established "invasive species" -the New fauna now closely tied to the Old fauna,
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