Myriophyll of Brazil, American crayfish, crassule of Helms, etc., so many species from elsewhere and now present in Normandy. These invasive alien species (EEA or invasive species) are considered the third cause of biodiversity loss after habitat degradation and unsustainable use of biodiversity. They take the place of local species, disrupt natural environments and can harm health and economic activities. The IAS theme is at the heart of public policy and is reflected in many strategies and other framework documents at various scales. As such, actions related to invasive species are therefore considered of public interest:- European Union Biodiversity Strategy to 2020 — Objective 5: Combating invasive alien species — “Towards an EU Strategy on Invasive Alien Species” (COM (2008) 789 final) — European Regulation No 1143/2014 of the European Parliament and of the Council of 22 October 2014 on the prevention and management of the introduction and spread of invasive alien species: adoption of a list of 49 species (fauna and flora) published in July 2017 in the Official Journal. The regulation has therefore been directly applicable since 9 August 2017 by the Member States.- Article 23 of the Grenelle Environmental Law — National Biodiversity Strategy 2011-2020 Strategic Direction D, objective 11: Controlling pressures on biodiversity — Strategy for the management of invasive alien species in the Loire-Bretagne Basin 2014-2020- Strategy of the former Lower Normandy Region for biodiversity — Action 6.2.2: Action against invasive speciesMoreover, the European regulation revives the draft of the national strategy on invasive alien species, carried out by the MEDDE (updating the environmental code, control plans, etc.) and accompanied by the Ministry of Health and the Ministry of Agriculture.- July 2016: creation of a committee of experts (MNHN, UICN France, FCBN, ONEMA, ONCFS, IFREMER) — October 2016: presentation of the 1st version of the document -> compendium of local actors and public consultation — November 2016: the National Strategy on IAS is submitted to the NNPC — March 2017: launch of the national strategy on IAS in line with the law enforcement decree for the recovery of biodiversity.In 2013, a strategy to combat invasive species threatening the biodiversity of Basse-Normandie was adopted and developed in an operational way by an action plan 2013-2015, historically led by the Conservatory of Natural Spaces of Basse-Normandie.Today, a new Norman strategy on IAS has been drafted and is also translated into an action plan 2018-2022 which will be moderated by the Conservatoire d’Espaces Naturels de Normandie. This association is a major player in the territory that makes available its technical skills and its human resources to various regional actors: local authorities, private owners and managers of natural areas In fact, every actor in the territory is concerned by the flooding of invasive species in natural, rural and urban environments, both local and regional authorities, space managers and individuals.This request for financial assistance for the Conservatory of Natural Areas of Normandy is the delineation of the regional programme of actions relating to invasive Exotic Species. The Caen site operates on the departments of Calvados (14), Orne (61) and Manche (50), and the Rouen site intervenes in the departments of Seine-Maritime (76), Eure (27). Although the actions remain territorialised, it is a single and coherent programme at the level of the Normandy region.