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Weights for adult cougars of over 24 months of age from Torres del Paine National Park, Chile. From Ecology of the Patagonia puma Felis concolor patagonica in southern Chile, by Franklin et al.
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The males in this study averaged ~76 kg in weight, here no range is given to know how much the heaviest and lighter ones weighed. The females averaged close to 50 kg which is really impressive and the highest average for Patagonian specimens for both sexes recorded.
Unfortunately, I cannot include the weights in the table of data compilation as the individual values are not given, though I'm sure that if we were to include these weights, plus those from Suquist, our sample size would be of 18 individuals and well above 70 kg in average, my guess is around 72-73 kg. It seems plausible that Patagonian cougars are indeed the largest of their species being slightly heavier than Rocky Mountains individuals, but the difference seems to be minimal and plenty of overlap occurs; and solidifying their position as 4th largest extant felid comfortably.