Studies of the feeding habits of wolves that have returned to Germany in the last ten years show that livestock make up less than 1% of their diets. The head of the Zoology Department at Senckenberg Museum of Natural History said over 3,000 samples of wolf scat were collected and tested for undigested remnants of animal prey such as hair, bones, hooves and teeth. Zoologists were able to determine that wild ungulates accounted for over 96% of the wolves' prey, the majority being roe deer followed by red deer and wild boar. Hares made up a small portion of their diet. Wolves will not risk injury by trying to take well guarded livestock as long as there is sufficient wild prey according to the head of the Department in Görlitz. Wolves migrating from Poland to the German region of Lusatia have also changed their diet. In Poland wolves primarily eat red deer while in Germany they eat roe deer. The explanation for the dietary change lies in habitat differences. In Germany, the forested areas tend to be smaller and crossed with paths and fields that provide a more open habitat that roe deer prefer. The dietary adaptation was made in less than two generation of wolves, but it has taken more than ten years for the German wolves to feel at home enough to begin breeding. Legal protections were introduced for them in 1990. At present about nine wolf packs live in Lusatia on the Muskau Heath, a military training area, with about 34 pups.