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Close to 7,000 different species are owned by pet owners across Europe, including mammals, birds, reptiles, amphibians, fish. Some of these pet species are imported from outside Europe and can potentially cause ecological problems if they escape or are released in the environment. The importation of some invasive alien species is prohibited, see Council Regulation (EC) 338/97 [PDF, 3.78 MB] due to their invasive character and the fact that their introduction has an adverse impact on native species. In addition, the Council of Europe has designed a voluntary code of conduct [PDF, 1.92 MB] to raise awareness within the pet industry and among owners and keepers of pets and provide practical guidance to reduce further the chances of pet species becoming invasive in Europe.

Scientists from the CNRS, the IRD, and the Muséum National d’Histoire Naturelle have just released the most comprehensive estimate to date of the financial toll of invasive species: nearly $1.3 trillion over four decades. Published in Nature (31 March 2021), their findings are based on the InvaCost database, which is financed by the BNP Paribas Foundation and the Paris-Saclay University Foundation’s AXA Chair of Invasion Biology. The annual expenses generated by biological invasions are only increasing, with no sign of any slowing.