Deer House (image) Penn State Share Print E-Mail Caption It turns out that Duane Diefenbach's observations of white-tailed deer in Pennsylvania are identical to what wildlife researchers around the world have seen with other species. On average, mammals move distances two to three times shorter in human-modified landscapes than they do in the wild. Credit Pennsylvania Game Commission Usage Restrictions Non commercial use only Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.