Tree-climbing, cranes, chemical knockdown—collecting samples from the canopies used to be very time-consuming. Scientists from the UDE's working group "Aquatic Ecosystem Research" led by Prof. Dr. Florian Leese now had a brilliant idea: Shortly before a forecast downpour, they placed four rain samplers beneath oaks, beeches, pines, and larches in the Diersfordter Wald and in the Großer Veen on the Lower Rhine region.