As predators, gray wolves help to maintain balance in the food web. The loss of wolves in ecosystems have lead to the overpopulation of other animal species. Gray wolves communicate to each other through howling, body language and scent. Howling is used to assemble the pack, talk to other packs, assert territorial claims or as a source of pleasure. On a calm night, howls can be heard from as far as 120 miles away.
Wolves use their faces and tails to indicate their emotion and status in the pack.
A pack marks its territory by urine and feces.