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In humans either for biological or cultural reasons there are life expectancy differences by sex. But how about non human mammals? Are there known life expectancy differences in non human mammals by sex?

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Are there known life expectancy differences in non human mammals by sex?

Yes, there are. It is not well studied in general, but for certain species it is. Here is a relevant excerpt (Austad, Fischer, 2016):

Females live longer than males in humans and all Old World monkeys and apes for which we have the best data. . . This appears to be true in both wild and captive populations. . . Yet whether there is a general mammalian pattern of greater female longevity under protected, captive conditions where intrinsic physiological aging dominates mortality patterns, is not known because so few species have been rigorously investigated. What is known about the best described species indicates that all show a substantially different pattern from humans.

See the linked study for more information. There is a whole section on sex differences in lifespan in mammals.

In general, in any species where males fight fiercely amongst each other for status, I would also consider it likely that males have shorter lifespan on average than females. Although I don't have a good citation for this at the moment.

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