Get to know the Biotope of Charlois; from the rats in the Maas to the bats in your cavity walls. Together we will investigate how nature makes good use of Rotterdam's urban planning and technological infrastructure to make the city their home. Ecologist André de Baerdemaeker will guide us through Charlois and its surrounding area, from the derelict Wielewaal to the docks of the Waalhaven, to see what thrives between the asphalt and concrete.