While male yearlings usually reach their sexual maturity only after the main mating season, female yearlings can compensate for high mortality rates and may be responsible for about 50% of all young born in a year.
Dok muški jednogodišnjaci dostižu spolnu zrelost tek nakon glavne sezone parenja, jednogodišnje ženke mogu nadoknaditi visoku stopu smrtnosti i ponekada kote 50% svih mladih rođenih tijekom jedne godine.