Destructive invaders: Calico crayfish threaten species diversity

The last remaining habitats of amphibians and dragonflies are at risk. Calico crayfish are endangering biodiversity along the upper Rhine. These crayfish can strip entire biotopes bare. They've completely destroyed a project to reintroduce marsh turtles costing millions of Euros. We meet a frustrated research team and a fisher who says he can't simply stand by and watch - and who catches and eats as many of the crayfish as possible.

Courtesy of DW Documentary on YouTube. Watch on YouTube ↗

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