Motherhood is full of challenges. Mums need to look after not only themselves but also their offspring: mothers make sure the young have good food, healthy and develop well, and they need to shelter the young from harsh environment, nasty neighbours and hungry predators. In addition, mums need to keep a watchful eye on their partners: as an eminent neurobiologist puts it, from the mother’s point of view the husband is just yet another – not necessarily grown-up – offspring.