A female entering estrus calls the male with a tearful, nasal roar. A male looking for a female does not waste time on feeding and can lose up to 1/5 of his body weight during the estrus period. Estrus lasts about 4 weeks, from August to October in Eurasia and from September to November in North America.
Males compete for a female, although fights between bulls occur much less frequently than in other deer and are less spectacular. The bulls line up facing each other, gain momentum with their heads down, and then clash with their antlers. The winner is the one who manages to push the opponent further.
