Killer shrimps, quagga mussels and carpet sea squirts. They may sound like monsters from a 1950s B movie, but their presence is a very real and growing threat to the UK’s biodiversity.
These are just three of nearly 2,000 non-native species (NNS) established in the UK today. Around 1,800 are terrestrial, with smaller numbers infiltrating the marine and freshwater environment. And the numbers are growing. According to DEFRA, a further 10-12 non-native species arrive on our shores every year.