Here are the data on the annual winter capture of Yellowstone Park wolves.
While the weight data of 2 packs is missing, but just two of these giant “canadian wolves” that were measured topped 100 pounds.
| Wolf # | Date of Capture | Pack | Sex | Pelt Color | Age Class | Weight pounds |
| 209F | 01/30/07 | LEOPOLD | FEMALE | BLACK | ADULT | 88 |
| 383M | 01/30 | AGATE CREEK | MALE | GRAY | ADULT | 101 |
| 470F | 01/29 | OXBOW CREEK | FEMALE | BLACK | ADULT | 77 |
| 527F | 12/31/06 | SLOUGH CREEK | FEMALE | BLACK | ADULT | 86 |
| 569F | 12/31 | DRUID PEAK | FEMALE | GRAY | ADULT | 88 |
| 570M | 12/31 | DRUID PEAK | MALE | GRAY | PUP | 86 |
| 571F. | 12/31 | DRUID PEAK | FEMALE | GRAY | PUP | 80 |
| 572F | 01/01/07 | YELLOWSTONE DELTA | FEMALE | BLACK | ADULT | |
| 573M | 01/01 | YELLOWSTONE DELTA | MALE | GRAY | PUP | |
| 574F | 01/01 | YELLOWSTONE DELTA | FEMALE | BLACK | PUP | |
| 575F | 01/01 | YELLOWSTONE DELTA | FEMALE | GRAY | ADULT | |
| 576F | 01/01 | YELLOWSTONE DELTA | FEMALE | GRAY | ADULT | |
| 577M | 01/05/07 | GIBBON MEADOWS | MALE | GRAY | PUP | 88 |
| 578F | 01/05/07 | GIBBON MEADOWS | FEMALE | BLACK | PUP | 81 |
| 586M | 01/29/07 | MOLLIE’S | MALE | GRAY | ADULT | |
| 587M | 01/29 | MOLLIE’S | MALE | GRAY | ADULT | |
| 588F | 01/29 | OXBOW CREEK | FEMALE | BLACK | PUP | 88 |
| 589F | 01/29 | OXBOW CREEK | FEMALE | GRAY | PUP | 90 |
| 590M | 01/30 | AGATE CREEK | MALE | BLACK | PUP | 110 |
| 591F | 01/30/07 | LEOPOLD | FEMALE | GRAY | PUP | 73 |
| 592F | 01/30 | LEOPOLD | FEMALE | GRAY | ADULT | 88 |
| 593F | 01/30 | LEOPOLD | FEMALE | GRAY | PUP | 77 |
Added May 14. Past years’ capture data.
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Ralph Maughan
Dr. Ralph Maughan is professor emeritus of political science at Idaho State University with specialties in natural resource politics, public opinion, interest groups, political parties, voting and elections. Aside from academic publications, he is author or co-author of three hiking/backpacking guides, and he is President of the Western Watersheds Project.
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Oh c’mon Ralph,
Surely you can do better than this when trying to shoot down the “Canadian” wolf thing!!
There are only three males listed WITH weights, one adult — 101 pounds, two pups — one at 86 and the other at 110 (wow, he’s a whopper). Isn’t it rather convenient that the other males don’t have weights listed?? Now if I was some kind of a conspiracy theorist, I just MIGHT find that suspicious. ;^)
Layton
Layton,
I anticipated someone like you would ask this very question, so today I’ll put a link to past years’ data. I guess you never read my old web page and the capture data posted there.
Thanks for highlighting the post.
Wow! 110lb pup? Those agates must be eating well. 🙂
I had been told that by 10 months most pups were 90% of their adult weight, but several month later a wolf biologist posted as said “no, they can still grow a lot.”
I wish this contradiction had been followed up.
It’s ironic that the largest wolf captured was a pup. I probably need to follow up and see if they made an error.
One thing that plays into wolf weight is that they will gorge, sometimes 20 or more pounds at a sitting. Reasons are varied, they will go somewhere and cache food, take food back to a den site for the pups and bitch, or because a pack can go days between kills they will just gorge as a survival mechanism. I am not saying that is the case with this pup, he just maybe just the next Shaquille O’Neill of wolves.
…in the early seventies I had the privilege of spending some time with a 8 month old c.l.Arctos that weighed in at 90 lbs. Imagine trying to feed that kid. :*)
Thanks so much for the very detailed information on the weights of Yellowstone’s wolves. I am very interested in the size ranges of wolves and other wild dogs so find these yearly weight records of great interest. I am looking forward to the winter 2007/2008 weight records.
Keep up the good work and well done for creating such a great site, Ralph!