Somewhere in this image flies a lonely bat, can you spot him? Taken from the window of my house. Every evening around sunset a few small bats fly by looking for diner! Bats love Rotterdam! Its one of the largest bat reserves in the Netherlands! Why so much in the city and not in the forest? There are 22 species of bats and 10 of them live in Rotterdam. A big, stony city like Rotterdam makes it easy for bats to stay. There are also many in the parks in the city. Good for insect control! From March they fly off and on again!