Aaand we even made the cover! With beautiful Gloria, who is grooming her infant, Gwen, two bonobos of the Kokoalongo community at the Kokolopori Fieldsite in the Democratic Republic of the Congo.

However, surrounding vocal communication - that is, communication not specifically directed at the infant - was present at broadly equivalent levels in chimpanzees, bonobos and humans.

We show that human infants receive dramatically more infant-directed vocal communication than non-human great ape infants.