Brain size and fertility in mammals may depend on who cares for offspring

The evolution of larger brain size in offspring is associated with the amount of paternal care in mammals, whereas higher fertility in the mothers is correlated with additional care support from individuals that are not the offspring’s biological parents (alloparents), according to a study published in the journal Behavioural Ecology and Sociobiology.
Source: EurekaAlert, https://www.eurekalert.org