Abstract
The social behaviour of four colonies of hoary marmots ( Marmota caligata) was studied in Glacier National Park, Montana, during the summer of 1970. Colony structure involved a dominant male with a few females (3 years or older), 2-year-olds, yearlings and pups. Patterns of burrow use, greetings, play, and aggressive chasing are described, indicating a closely-integrated social structure with reproductive patterns suggesting late dispersal and maturation. A close resemblance to the behaviour of the Olympic marmot ( M. olympus) is proposed.
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