Rutting behaviour in a barren-ground caribou population

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