Predicted relative red fox abundance in the Black Forest extrapolated from the results of the feces counts (left) and the camera traps (middle).

<p>Difference between the two predictions in percent (prediction from feces counts – prediction from camera trap, right). The left figure is reprinted from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0094537#pone.0094537-Gthlin1" target="_blank">[25]</a> under a CC BY license, with permission from Springer, original copyright 2013.