Besides legal texts, the regional strategies are also noteworthy, such as the one developed by the Council of Europe, as well as recommendations made in other international fora such as the Bern Convention on the Conservation of Wildlife and natural Environment of Europe that has so far issued 19 recommendations on the subject, such as those relating to:

  • the control of the grey squirrel (Sciurus carolinensis) and other alien squirrels in Europe (2005)
  • the eradication of some invasive alien plant species (2007)
  • the European Code on pets and invasive alien species (2011)