Another ecological story about the connection of “everything to everything”: climate change is having a negative impact on the breeding success of collared flycatcher through a cascade of further impacts. Climate warming has caused an increase in the frequency of oak masting, which favors higher rodent densities that destroy flycatcher nests. Demonstrating these connections was possible thanks to the cooperation between specialists from different biology/ecology departments: ornithologists, teriologists and botanists (Bogdan Jaroszewicz and Patryk Czortek). The paper was published in Science of the Total Environment. DOI: 10.1016/j.scitotenv.2020.142084.