far away from the bright lights of amsterdam dr commute spoelstra is often a creature that likes to operate under the cover of darkness. he is studying how lights are affecting bats so far his team has found that the 19 species of bat found in the netherlands react in widely different ways. let's have a very strong response to learnt there's actually driven by mostly by fear of predators so if you're about that flies very slowly you better hide away and don't show yourself in the light because it's it's risky however if you're a bat that flies very fast it's very agile and it don't need to be afraid that much for predators so you actually like taking away valuable habitat from the slow flying species and exclude giving it to do these already common. but species and that's one of course not a good thing and domes of biodiversity you actually reducing biodiversity that nocturnal species are sensitive to the blue range of light as they have evolved to use the moon to navigate and brag of the blue the more distracting it is to test how species respond to other parts of the spectrum the research