BBoumort and the roar of the deer The roaring season begins in mid-September and lasts until mid-October. During this time, the dominant individuals develop an intense instinct to keep the harem together. Therefore, during this period, they constantly chase one another and fight other competing males, causing exhaustion at the end of the mating season. It is a wondrous and unique spectacle to behold, which can be arranged accompanied by a guide.