FILE PHOTO: A red swamp crayfish (Procambarus clarkii) is hold by Charles Oliver Coleman, of the Leibniz Institute for Research on Evolution and Biodiversity, after he fished it from a pond at Tiergarten park in Berlin, Germany, August 24, 2017. The invasive red swamp crawfish have been spotted scuttling around the paths of the Tiergarten park and also parading outside the neighboring Spanish Embassy. REUTERS/Fabrizio Bensch/File Photo