2013 Yellowstone Wolf Report Download

How many wolves were in Yellowstone in 2013, what were their wolf pack territories, and what were their kills.
2013 Yellowstone Wolf Report

Sept 22, 2014, the National Park Service has published its annual report about the numbers and health of reintroduced wolves in Yellowstone National Park.

There were at least 95 wolves in 10 packs and one group (8 breeding pairs) living primarily in Yellowstone National Park during December 2013.

Pack size ranged from 2 to 18 and averaged 8.6 wolves. Nine of 10 packs, plus one lone female, had pups. At least 41 pups survived to the end of the year.

2013 Wolf Territories in Yellowstone


Yellowstone Wolf Populations from 1995 - 2012

Wolf Population Chart for Yellowstone National Park

Staff detected 269 kills probably made by wolves in 2013, including 193 elk, 16 bison, 13 mule deer, and a few other species. Elk kills were calves and yearlings (43%), followed by cows (33%) and bulls (14%). Some kills could not be identified to age or sex. Bison kills included nine calves, two yearlings, two cows, two bulls, and one adult of unknown sex.

Other research involving wolves during 2013 included population genetics, population regulation, disease, hunting behavior, spatial analyses of territory use, pack leadership, multi-carnivore-scavenger interactions, breeding behavior, dispersal, and observations of wolf, grizzly bear, and bison interactions in Pelican Valley.

Download 2013 Wolf Report PDF


Wolf from Canyon Pack near Mammoth Hot Springs in Yellowstone

2014 Yellowstone Wolf Report Download

December 3, 2015:: How many wolves were in Yellowstone in 2014, what were their wolf pack territories, and what were their kills. Download the report.

Wolf hunting patterns. Photo courtesy Public Library of Science

How Yellowstone Wolves Hunt Revealed in Research Report

Yellowstone wolves pick their prey depending on wolf pack size. Small packs attack elk. Larger packs attack bison.

Gray Wolf Howling

Yellowstone Wolf Population Increased in 2014

According to the U.S. Fish and Wildlife Service, the Wyoming wolf population grew by 9 percent in 2014. There are 104 wolves in 11 packs in Yellowstone.

Yellowstone Wolf Howling in Winter

Concerns Remain About Yellowstone Wolf Population

In March of 2013, officials estimated that just 71 adult wolves reside within Yellowstone’s boundaries, a 14-year low and less than half of 2007’s total.

Yellowstone grey wolf in the snow

Yellowstone Wolves Killed December 2012

Over the past few weeks, hunters have killed seven wolves originally from Yellowstone National Park. Each of the wolves wore a GPS research collar, which helps park officials to monitor the wolf packs’ movements.

Dave Shumway wolf 06 featured photo

Yellowstone Wolf 06 Remembered. Photos by Dave Shumway

Wolf 832AF (AKA "06" - for the year she was born) was the Alpha Female of the Lamar Canyon Pack killed on Dec 6, 2012 as part of Wyoming's wolf hunt.


Wolf Hunting Banned in 2012

Montana wildlife officials have shut down wolf hunting and trapping in areas bordering Yellowstone.

yellowstone wolves off endangered species list

Changes Seen a Decade After Yellowstone's Wolf Reintroduction

Changes to Yellowstone 10 years since the 1995 wolf reintroduction program - 306 inhabited the ecosystem and created a balance between predators and prey.

Yellowstone Wolf

Gray wolves create balance between predator and prey in Yellowstone

Contrary to what some wolf opponents claim, ecology expert says gray wolves in Yellowstone will not wipe out prey, such as elk and deer