Along a small stream in the nature reserve Pfälzerwald in Germany, this black-and-blue damselfly finds his or her way. Damselflies are distinguished from dragonflies by a number of features. In general damselflies are built lighter and their eyes are relatively small and far apart. When resting, a dragonfly will expand its wings behind the back (with the exception of the armored damsels), while dragonflies keep them spread. The larvae of both species live in water and are fairly small, about two centimeters long, with a narrow abdomen. But the larvae of dragonflies have three feather-like tail gills and thus ' jet-propulsion ' under water, while the larvae of damselflies have no gills and move around by squirming their abdomen back and forth. Damselflies are found mostly in plant-rich, clean, still waters.