Nature: Female putty-nosed monkeys use males as hired guns to defend against predators like leopards
Researchers studied groups of putty-nosed monkeys in the north of the Congo They exposed the monkeys to a 'leopard model' — a man in a leopard-print sheet The team found that the sexes responded differently to the simulated threat Females summoned males, to mob the intruder, by emitting a general alarm call The males responded with 'pyow' and 'kek' calls to reassure the female monkeys
Source: dailymail.co.uk