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"We thought it could be a creative way to encourage our females to show a little affection to males that might not have been so lucky in love," Park Director Matt Lovatt said on the zoo's website. "Females in season mate with several males so paternity among our furry residents is never known. Each birth is vital to the species with Barbary macaques being classed as endangered."
Lovatt said zookeepers expect to discover whether the visit had any effect on the monkeys when birthing season arrives in late spring or early summer.