Fernando Colchero

Women are much more likely to outlive men.

On average, men can expect to live 76 years compared to 81 for women.

Researchers at the Max Planck Institute studied 528 species of mammals and found females live about 13% longer in many species.

Study author Fernando Colchero says genetics play a role, pointing to a protective effect of two X chromosomes, and risky mating behaviors are a factor, too.

The sex that spends more time caring for offspring tends to live longer.

Researchers say mimicking the preventive care habits of women could help narrow the gap.

Allison Aubrey, NPR News.