Over recent decades a general decline in European hare (Lepus europaeus) densities all over Europe has been recorded. To increase the European hares living conditions, fundamental aspects of the species ecology have to be known. In this doctoral thesis, on the one hand, the species activity pattern and space use and, on the other hand, the European hares habitat preferences were investigated. We equipped nine European hares with GPS-collars programmed to take one fix per hour. We were therefore able to study the influence of daylight regime on the hares diurnal locomotor activity patterns. As the telemetry was conducted in a cereal dominated agricultural landscape, we moreover investigated the effects of harvest on the hares space use. Furthermore, the vegetation characteristics at hares resting places during daytime and habitat selection during activity, i.e. the early night hours, were analysed. The studies on hares resting places and habitat selection was conducted for the first time in an agricultural area with low hare density (6 hares per 100 ha).