Abstract
In the barren-ground caribou population of northwest Alaska migratory behaviour was observed to continue throughout the breeding season. The peak of rutting activity occurred during the third week of October in both 1960 and 1961. A harem-type social organisation is well developed during the rutting season in nonmigratory populations of Rangifer tarandus but is not developed among the barren-ground caribou which show open groups throughout the year. The rutting activities of the barren-ground caribou bull may be divided into two phases. During the preliminary phase the bull appears to test the oestrous state of the females around him and select a female in heat. The tending phase, during which the bull follows closely and defends a single cow, apparently follows the preliminary phase. A modified form of threat posture, called the “threat-display”, is directed towards the cow by the bull during both phases.
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