Notes on Cougar Productivity and Life History

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Abstract
Records collected principally from 1946 through 1958 in Utah and Nevada have shown that the cougar may have young any month of the year. However, birth months, as determined by reference of juvenile weights from 145 litters to a growth curve, indicated that about 60 per cent of the litters were probably born from June through September with a peak in July. The highest incidence of pregnancy for 199 mature females was noted in June and July. Forty-one per cent of 299 mature females had young at the time of capture. Evidence is presented that some females apparently have young as often as 12–15 months, but a 2-year interval appears the rule. Most young apparently remain with their mothers for at least a year. The average size of 258 postnatal litters was 2.9 (range, 1–5) and of 66 prenatal litters it was 3.4 (range, 1–6).

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