A group of geladas monkeys (
Theropithecus gelada), pictured above, huddle to keep warm on a cold day in the Wilhelma Zoo in Stuttgart, Germany.
Endemic to Ethiopia’s cold Afroalpine and sub-Afroalpine grasslands, the species is the only primate, apart from humans, that primarily lives on land rather than trees. They spend most of their time grazing grass and have complex social systems focused around
vocal communication, hugging, and
grooming, especially between females.
“On this day … the chill in the air made ideal conditions for a gelada group hug that included some mutual grooming,” Julie Larsen, Mongabay’s photo editor, said of the moment she captured in 2014.
“As I looked down on their gathering, the monkey in the middle peered up at me, clearly benefitting from her fortunate position,” she added. “Then, the group closed over her, a single blanket of chocolate-colored shaggy fur against the elements.”
According to Dario Fraschetti, a scientific assistant at Wilhelma Zoo, animals with short hair, as in the photograph, are likely females. Males have distinctive long manes and a bright red mark on their chests. Of the 30-40 gelada monkeys that live at the zoo, the vast majority are females, which is similar to their social structure in the wild.
The zoo participates in a Europe-wide effort to keep a healthy captive-bred population of the species in partnership with EAZA
Ex situ Programme (EEP).
Hugging between females in the wild has been
observed to increase between unrelated mothers during the first months of their offspring’s life, which researchers said may be to “improve female cohesiveness against males, thus reducing the risk of infanticide, which is particularly high in geladas.”
The monkeys also display social behaviors that are rare among mammals such as
consoling and protecting victims of conflict. And like humans, they also exhibit
contagious yawning, which is thought to be linked to empathy.
The species is listed as
least concern by the IUCN, the global conservation authority. Though the organization notes that the conservation status is partially due to an absence of detailed data on their geographic range and demographic trends.
Aerial population surveys in the 1970s estimated a population of approximately
440,000 geladas. But a recent
synthesis looking at studies published between 2009 and 2024 put the current population estimate at just under 30,000; though, the authors noted that further studies are needed.
Research has also found that gelada monkeys have an interesting relationship with Ethiopian wolves (
Canis simensis). Reminiscent of the friendship between humans and dogs, a 2015
study found that the two species don’t display aggression toward each other. Wolves were observed spending more than an hour roaming among the monkeys in peace while looking for rodents. Moreover, the study found that the wolves had more rodent-hunting success while in the company of Gelada monkeys.
Banner image: Gelada monkeys engage in a group hug in Wilhelma Zoo in Germany. Image © Julie Larsen.