Supermom Primates Raise Twins

The first occurrence of twins for free-ranging Tibetan macaques has just been documented, revealing how rare survivorship of twins can be in many primate species, and how important mothers are to their success.
It’s possible that only supermom primates, humans included, can properly raise twins. In the wild, twins often die shortly after birth, or only one lives into adulthood.
Successful parenting of twins among all non-human primates is rare, save for one family of South American monkeys, the Callitrichidae, which includes tamarins and marmosets. Females of this primate family routinely give birth to twins, with males providing substantial care. Sometimes mothers and dads of these primates will even raise triplets.