Moreover, these mice suffered from severe motor defects and did not live to adulthood. (sciencemag.org)
Together, they had seven children, four of whom lived to adulthood and all of whom went free. (bookpage.com)
In fact, many hunter - gatherer societies show a larger proportion of deaths in childhood, but those that do live to adulthood often have good lifespans.) (evolutionaryparenting.com)