Abstract
Quantitative observations were made of forage site location and foodgathering behavior of Columbian ground squirrels (Spermophilus columbianus) and hoary marmots (Marmota caligata) cohabiting a talus slope in northwestern Montana. Although their feeding sites showed much spatial overlap, ground squirrels more frequently selected areas with new-growth vegetation and routinely employed a wider variety of food-gathering postures than did marmots. These behavioral differences are comparable to those noted for other different-sized mammalian grazers and may be dependent on relationships between (1) general size-related physiological and/or morphological characteristics and (2) dispersion patterns of food items.
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