Is  there a sex-mated difference in life expectancies in mammal, other than humans

MANY SPECll!S OP MAMMALS have sex-biased life expectancies.  Human women live an average of 7.8\ percent longer than  men, but for mammals as a whole,females outlive males by 18.6 percent.  This  'advantage is especially Strong In cenaln species. A female orcan can up 50 to 90 yea,s, while males live 30 to 50The average age for a.lioness Is L5 toJ6 years, compared with 8 to 12' years fora lion. males tend to have largerbodies and greater nutritonal demands. having two X chromosomes may also protect females from certain life-shortening mutations. In many species, males also leave their birth group and have to face dangers on  their own, Including conduct with other males.

Mtltua. BawldPf.l, research zoologist mammals~

Natlonal Museum of Natural History