Grey wolf
- The gray wolf- The gray wolf, or just Wolf, was once really common throughout North America, but widespread habitat destruction, over-hunting, and growing urban areas have reduced wolf population in North America, mostly in the US. If there were still some wolves in Acadia National Park, they could be hazardous to the deer population. they also have no problem attacking larger species so this could also reduce the horse population.
https://sites.google.com/site/galensacadianationalpark/endangered-species
http://www.fanpop.com/clubs/wolves/images/4966029/title/grey-wolf-snow-wallpaper