Close up of a hamadryas baboon's face
Stable

Hamadryas Baboon

Papio hamadryas
Papio hamadryas
  • CLASS: Mammalia (Mammals)
  • ORDER: Primates
  • FAMILY: Cercopithecidae
  • GENUS: Papio
  • SPECIES: hamadryas

ABOUT

This baboon is no buffoon: Once revered by Ancient Egyptians as representatives of the Egyptian god of learning, Hamadryas baboons are also referred to as Sacred Baboons. These hardy Old World monkeys display complex social behaviors, and can live in troops of several hundred individuals. Though currently extinct in Egypt, these monkeys can be found in large populations in Ethiopia, Somalia, Saudi Arabia, and Yemen. In fact, no other species of baboon resides as far north as Hamadryas baboons. The remarkable silver manes and pink faces of adult males add to the unique nature of these intelligent primates.

Hamadryas baboons are large-bodied monkeys with a strong build and a dog-like muzzle. Both males and females have brown or light gray fur. While the females of this species have hairless black and brown faces, the male Hamadryas baboon has a distinctive mantle (mane) of long silvery hair and a bright pink face and backside. These baboons sport a relatively short, tufted tail that is not prehensile.

Hamadryas baboons are diurnal animals, meaning that they are active during the day. After awaking around sunrise, troops of several hundred baboons will come together to "monkey around." This includes chasing, playing, and social grooming within their "One Male Unit" (OMU) social group. Afterward, their work begins. The troop leaves the sleeping site, breaks off into smaller groups called bands, and the bands separate into OMUs to forage for food. The troop reunites in the afternoon for a water break, especially during dry times. Then, it’s back to more foraging in OMU formations. As the sun sets, the groups return to the sleeping site, and the monkeys coelsce once again for more social grooming before it is time for bed.

Although staring contests and lip-smacking may seem like trivial, if not amusing, ways of interacting with our friends, these behaviors have completely different meanings to Hamadryas baboons. In fact, staring is considered a threat behavior! Other threat behaviors include tension yawns, during which a baboon’s canine teeth are clearly exposed, as well as head bobbing. But fear not, these baboons have behaviors known to comfort one another as well. Social grooming is extremely important for building relationships. Teeth-chattering and lip-smacking are considered reassurance behaviors, and are usually performed by dominant males as a sign of comfort. Dominant males may also produce a two-phase bark to ward of predators and other male baboons.

Hamadryas baboons are Old World monkeys. This means that they belong to a group of monkeys found in Africa and Asia. (New World monkeys are found in the tropics of Central and South America.) There are many physical differences between Old and New World monkeys. Hamadryas baboons have classic Old World monkey characteristics like non-grasping (or prehensile) tails, they are primarily terrestrial, and they have opposable thumbs that are very similar to a human's thumb. These traits are rarely seen in New World monkeys.

Hamadryas baboons can fall prey to leopards, hyenas, and Verreaux’s eagles; however, many animals that may have been natural predators to the baboons historically no longer exist within the baboons’ habitat. Hamadryas baboons rely on assembling into large groups for protection. Groups are largest while getting water and sleeping, as these are times when baboons are most vulnerable. As another level of security, troops of baboons favor sleeping in high places.

HABITAT AND DIET

Hamadryas baboons live in diverse habitats ranging from subdesert to savanna and into steppe, plains, and arid brushland. Rather than trees, these primates prefer to live near high cliffs where they can gain access to acacia, opuntia cactus, and a water source.

Hamadryas baboons forage for food by day in One Male Units (OMUs) made up of a small group of monkeys from the larger troop. At night, the smaller groups coalesce at the sleeping site to form troops of several hundred individuals. Sleeping sites are often located on cliff sides, but Hamadryas baboons will also occasionally find shelter in trees. Above all else, these monkeys make sure to find a home near water.

In the wild, the Hamadryas baboon is omnivorous; however the majority of its diet consists of plant matter. Hamadryas baboons in Africa and Arabia share a similar diet to some extent: both populations primarily eat grass seeds, roots, berries, and the flowers, leaves, and pods of acacia trees. Baboon populations in Arabia commonly eat cactus fruit and palm nuts, as well. Non-plant food sources make up a small portion of their diet and include bird eggs, carrion, small mammals, and occasionally insects like locusts. Since most baboons live in arid habitats, they are able to survive on low-quality diets for long periods of time in the wild.

FAMILY LIFE

Hamadryas baboons have a polygynous mating system, where the dominant male mates with more than one female. Within these social groups, called One Male Units (OMUs), females bond with males by grooming the male leader of their unit. This is where the male’s mantle (mane) comes into play, as it seems that grooming behaviors are exclusively focused on the male. 

Females give birth to one baby at a time. For the first 3 weeks of its life, a baby will hold onto its mother by gripping her hair as she moves around. Hamadryas baboon babies have pink skin and black hair until they are one year old, at which point their hair turns brown and resembles that of the adults. 

Males begin to establish their own units when they are between 4 and 6 years old, while females begin looking to join an OMU between the ages of 4 and 5. Female members of OMUs may change groups depending on changes in male dominance, which occurs often. Multiple OMUs will often work together forming a group called a band, hence, they "band together" at night to share sleeping sites. These groups are called troops and can include hundreds of individual baboons.

AT THE ZOO

Hamadryas baboons will be showcased in the new Conrad Prebys Africa Rocks exhibits to open in 2017.

CONSERVATION

Hamadryas baboons are listed as a species of Least Concern on the IUCN Red List of Threatened Species. They exist in stable, even growing populations. Once collected in great numbers for medical research, they currently face only a few localized threats. Their range often overlaps urban and agricultural areas. While these monkeys are commonly tolerated by humans, they are occasionally considered a pest, as they can destroy crops and can become aggressive when approached. As agricultural and irrigation development continues to expand, it may result in greater conflict with humans as well as habitat loss.

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LIFE SPAN

20 years in the wild; 31 years in zoos

YOUNG

Gestation: About 170 days

Number of young at birth: 1

Weight at birth: 1.3 to 2 pounds (.59 to .91 kilograms)

Age of maturity: 4 to 6 years

SIZE

Height (sitting): Adult female, 1.6 to 1.8 feet (.49 to .54 meters); adult male, 1.6 to 2.1 feet (.49 to .64 meters)

Weight: Adult female, 20 to 25 pounds (9 to 11 kilograms); adult male, 40 to 45 pounds (18 to 20 kilograms)

FUN FACTS

Unlike many other baboon species, the Hamadryas have a patriarchal "One Male Unit" social structure. Females groom their "leader" and males compete fiercely for their status.

Hamadryas baboons were so highly regarded in ancient times that evidence reveals that some were mummified after death.

Egyptians believed that Hamadryas baboons were sacred to Thoth, the god of learning.

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