A red swamp crayfish (Procambarus clarkii) is pictured in a pond at Tiergarten park in Berlin
A red swamp crayfish (Procambarus clarkii) is pictured in 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 neighbouring Spanish Embassy. REUTERS/Fabrizio Bensch