A breakdown of the Yellowstone Park wolf packs as of this fall

Here are the data on the Yellowstone “mid-year” wolf packs — the pack names and number of adults, pups, total pack size. Finally a numeric ID has been assigned to the pack.

Yellowstone National Park = 143 wolves; 14 packs (13 packs producing 76 pups) [at least 12 potential breeding pairs). Northern Range 1) Swan Lake- 2, 6, 8; 2) Leopold- 8, 11, 19; 3) 536F Group- 4, 8,12; Hellroaring- 4, 4, 4; 5) Agate- 7, 6, 13; 6) Slough- 8, 0, 8; 7) Druid- 4,11,15; Non- Northern Range 8 ) Mollie’s- 5, 6, 11; 9) Yellowstone Delta- 6, 5,11; 10) Bechler- 3, 5, 8; 11) Snake River Group- 2, 7, 9; 12) Gibbon Meadows- 7, 5,12; 13) Hayden Valley- 4, 2, 6; 14) Cougar Creek- 3, 0, 3; Total: 67, 76, 143.

I’m not sure why the “536F group” is not regarded as a pack because they have eight pups. There might be the belief that they will still rejoin the Leopold Pack from which they came. I don’t think they will. I am not sure why the new pack near the south entrance is called the Snake River group, rather than “pack.”

The Cougar Creek II Pack is regarded as a non-Park pack although it denned in Daly Creek at the extreme NW boundary of Yellowstone Park. There is also a new pack, the Eagle Creek Pack, just across the Yellowstone River between Gardiner and Jardine.

As I mentioned in an earlier story, the Park wolf population is up this year, after the huge decline of the last year, but there are still fewer wolves than in 2003 and 2004.







  1. Kathie Avatar

    As to why the 536F Group and the Snake River Group are classified as “groups” (rather than “packs”), I think that in order to officially be considered a pack, the group of wolves must produce pups which survive until December 31 of that year.

  2. Ralph Maughan Avatar

    That’s it. You are right, Kathie.

  3. Deanna (in Va) Avatar
    Deanna (in Va)

    I try to keep myself as informed as possible but maybe I’ve missed an update in the last several months…has anyone posted an update on the new pack that 253 M (the old Druid male that had taken the journey to Utah several years ago) had “formed” down south of YNP last year? I know he was in a fairly remote area at one time – but has there been any updates?

  4. Karl Moore Avatar
    Karl Moore

    Ralph, I may have missed it, but have you seen the 2005 wolf report yet?

  5. Ralph Maughan Avatar

    Yes, it’s been out for quite a while. Maybe I should put up a link?

  6. Sally Roberts Avatar
    Sally Roberts

    253M was last found somewhere in “the black hole of wolves”. I think that is somewhere in the Bondurant, Pinedale, Daniel area of Wyoming, but no information has been reported on him recently.

  7. Karl Moore Avatar
    Karl Moore

    Sorry, was underway for the rest of the week. Yes, I think a link would be very helpful. I, as many people do, use your site as the homesite for wolf reintroduction. Thanks for all the hard work.


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Ralph Maughan