When humans move species from one part of the world to another it can cause all sorts of problems - from non-native rodents wiping out entire seabird colonies to non-native water weeds choking our rivers. On this month’s Nature’s Voice Jane Markham meets three people who are coping with the impact of these invaders on a daily basis. Laura Bambini is an RSPB Scotland seabird recovery officer, Kelly Thomas, a reserves ecologist who has advice on how to recognise a new threat from the asian hornet and Danny Heptinstall, who as an RSPB policy officer, specialises in invasive non native species and biosecurity.