A macaque mother bounces her head up and down in front of her infant, followed by exaggerated lip smacking directed at the child. The infant shows signs of distraction before responding to his mother's display by nuzzling into her.

Found in "Monkey moms and babies communicate from the start" online at: sciencenews.org/view/generic/id/48171/title/Monkey_moms_and_babies_communicate_from_the_start

Credit: Ionica Consuel