File:The bison of Yellowstone National Park (1973) (20197484108).jpg

Title: The bison of Yellowstone National Park
Identifier: bisonofyellowsto00meag (find matches)
Year: 1973 (1970s)
Authors: Meagher, Margaret Mary; United States. National Park Service
Subjects: American bison; Mammals
Publisher: (Washington) : U. S. Dept. of the Interior, National Park Service
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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Habits 77 Valley and adjacent forest and meadow areas. In all of these areas there were small uprooted coni- fers and many rubbed trees. Small wallow-sized patches of grass (Fig. 29), apparently uprooted by horn- ing but not much used for wallow- ing, were another common sign of rutting activity. The period of breeding activity observed during this study (1963- 68) was shorter than that given by McHugh (1958). He observed in the much larger Hayden Valley population of that time that the season extended from 15 June to 30 September, with less activity during the first and last 2 weeks. Movements Migratory movements Most of the bison in Yellowstone are migratory, moving in spring from the lower wintering valleys to higher summer ranges, and re- versing this altitudinal migration in the fall. The migratory pattern was most apparent in the mixed herd groups which wintered in the Lamar, Firehole, and Pelican val- leys. Although all groups of a par- ticular wintering area did not move at once in spring, they all moved within a few days' time. Records kept during the study showed that mixed herd groups
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