Sulawesi crested black macaques, Tangkoko forest, Sulawesi.
This photo, taken in 2012, shows the bond that a mother has with her infant. The macaques nurse and carry their babies for approximately a year, during which time the baby becomes more and more independent.
Sulawesi crested black macaque (Macaca nigra), Tangkoko National Park, North Sulawesi, Indonesia
Photo: Andrew Walmsley