Rhesus macaque female and infant. There is a great deal of color variation in the rhesus monkey’s coat — from grey and tan to reddish.

Most rhesus macaque mothers are very dedicated to their infants. This infant would like to get down and play but the female prefers to keep it close.

Rhesus macaques spend most of their day foraging for insects, grass, seeds and other treats that the CNPRC Enrichment staff have provided them with. They receive twice daily feedings of special formulated “monkey chow”.

Rhesus macaques live in large social groups of around 80 individuals, both in the wild and at the CNPRC. This female is surrounded by a new infant and older juveniles, which are most likely her offspring. Juveniles stay in close contact with their mothers for the first few years of their lives.

Most rhesus macaque mothers are very dedicated to their infants. This infant would like play, but the female prefers to keep it close, using the infant’s tail as a way to forage and keep track of the infant at the same time.

A rhesus macaque juvenile.

Rhesus macaques’ life spans are about 18 years in the wild; at the CNPRC, with good nutrition and excellent medical care, these animals can live to the old age of 32 years. You can see two healthy geriatric females in this photo.

Rhesus macaques’ life spans are about 18 years in the wild; at the CNPRC, with good nutrition and excellent medical care, these animals can live to the old age of 32 years.

A rhesus macaque juvenile enjoying a fresh cherry tomato. In addition to their twice-daily feedings of special formulated “monkey chow”, animals are provided with fresh fruits and vegetables twice per week.

Cynomolgus macaque infant being cared for in the CNPRC nursery. They enjoy stuffed animals and banana treats (you can see the leftover banana on her face) similar to human infants.

Rhesus macaque juvenile enjoying freshly sliced apples and whole carrots. In addition to their twice-daily feedings of special formulated “monkey chow”, animals are provided with fresh fruits and vegetables twice per week.

A rhesus macaque male.

A rhesus macaque male.

Rhesus macaques live in large social groups of around 80 individuals, both in the wild and at the CNPRC. This photograph shows multiple females carrying both young infants and older juveniles. Juveniles will attempt to be carried like this as long as the mother tolerates it. Black markings that are visible on their backs and legs are dye marks used to identify individuals for health care and colony management. Also visible is the bright red hind area of a female in estrous.

Rhesus macaques live in large social groups of around 80 individuals, both in the wild and at the CNPRC. The early morning sun highlights this adult male rhesus macaque’s amber colored eyes.

Rhesus macaque juvenile enjoying a fresh cherry tomato. In addition to their twice-daily feedings of special formulated “monkey chow”, animals are provided with fresh fruits and vegetables twice per week.

Rhesus macaque juvenile enjoying the hanging barrel climbing structures in an outdoor field corral.

Rhesus macaque juveniles enjoying freshly sliced apples and whole carrots. In addition to their twice-daily feedings of special formulated “monkey chow”, animals are provided with fresh fruits and vegetables twice per week. Visible on the sides of their faces are their cheek pouches in which they have stored food for later consumption.

Hot summer days can bring some cool swimming pool entertainment for the rhesus monkeys. Wild rhesus monkeys also enjoy the water; swimming is a natural behavior for them, but in the wild they have to be cautious of water predators such as sharks.

Rhesus monkey adults enjoying a castle play structure in the outdoor field corrals. Every outdoor corral has at least one play structure in addition to A-frame houses, tire swings, balls, logs, Ferris wheels, and other forms of behavioral enrichment.

Rhesus monkeys explore a colorful new addition to their environment. Every outdoor corral has at least one Little Tyke play structure in addition to A-frame houses, tire swings, balls, logs, Ferris wheels, and other forms of behavioral enrichment.

Leftover harvest pumpkins in the fall are a special treat for the outdoor rhesus monkeys.

Fresh fruits and vegetables are a twice-weekly addition to the rhesus monkeys’ healthy diet of specially formulated monkey chow. Bananas are a favorite, as are carrots, apples, figs and other seasonal fruits.

A rhesus macaque juvenile. Outdoor animals are provided with many enrichment objects, including the tree trunk this monkey is sitting on, heavy duty hanging balls, plastic swinging barrels, and playground equipment.

Titi monkeys are tree-dwelling primates from South America, and live in monogamous family groups that consist of the parents and their offspring. Males and females sit with their long, thick tails intertwined and spend many hours sleeping and grooming each other. The father is the main caretaker for the infants, bringing the infant to its mother only for nursing until the infant is weaned at around 5 months of age. This photo shows an infant titi monkey with its father. The male titi monkeys at the CNPRC wear a necklace with a number so that they can be easily identified.

Chinese-Indian hybrid rhesus macaque female and infant.

When infants need to be cared for in the nursery, they enjoy stuffed animal companions, similar to human infants.