Denning of grizzly bears in the Yellowstone National Park area
Bears: Their Biology and Management
By: Steven L. Judd, Richard R. Knight, and Bonnie M. Blanchard
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Abstract
Radiotelemetry was used to locate 101 grizzly bear (Ursus arctos) dens from 1975 to 1980; 35 dens were examined on the ground. Pregnant females denned in late October, and most other bears denned by mid-November. Duration of denning average 113, 132, and 170 days for males, females, and females with new cubs, respectively. Males emerged from mid-February to late March, followed by single females and females with yearlings and 2-year-olds. Females with new cubs emerged from early mid-April. Den sites were associated with moderate tree cover (26%-75% canopy cover) on 30°-60° slopes. Dens occurred on all aspects, although northerly exposures were most common. Grizzly bears usually dug new dens but occasionally used natural cavities or a den from a previous year. Males usually dug larger dens than females with young. Eight excavated and 2 natural dens of the 35 examined dens were used for more than 1 year.
Suggested Citation
Judd, S.L., Knight, R.R., Blanchard, B.M., 1986, Denning of grizzly bears in the Yellowstone National Park area: Bears: Their Biology and Management, v. 6, p. 111-117, https://doi.org/10.2307/3872814.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Denning of grizzly bears in the Yellowstone National Park area |
| Series title | Bears: Their Biology and Management |
| DOI | 10.2307/3872814 |
| Volume | 6 |
| Year Published | 1986 |
| Language | English |
| Publisher | International Conference on Bear Research and Management |
| Publisher location | New York, NY |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bears: Their Biology and Management |
| First page | 111 |
| Last page | 117 |
| Country | United States |
| State | Idaho;Montana;Wyoming |
| Other Geospatial | Yellowstone National Park |