What Are Hyenas Classified As? Their True Taxonomy

Hyenas belong to the family Hyaenidae, which sits within the suborder Feliformia, the “cat-like” branch of the order Carnivora. That placement surprises most people because hyenas look and often behave like dogs, but genetically and anatomically, they are far more closely related to cats, mongooses, and civets than to any canine. The mismatch between appearance and ancestry makes hyenas one of the most persistently misunderstood groups of mammals, and their real taxonomy reveals an evolutionary story that is considerably stranger than the surface resemblance to dogs suggests.

Where Hyenas Sit on the Carnivore Family Tree

The order Carnivora splits into two major branches: Feliformia (cat-like carnivorans) and Caniformia (dog-like carnivorans). Dogs, bears, raccoons, weasels, and seals all belong to Caniformia. Cats, mongooses, civets, and hyenas belong to Feliformia. Molecular phylogenetic studies consistently recover Hyaenidae as a feliform family that forms a clade with the Herpestidae (mongooses) and the Malagasy carnivorans (fossas, falanoucs, and their relatives).¹ In other words, hyenas are more closely related to a mongoose than to a wolf.

The reason hyenas look so dog-like has nothing to do with shared ancestry and everything to do with convergent evolution. Hyenas and canids independently evolved similar body plans because they face similar ecological pressures: long-distance travel, pack-based or cooperative hunting, and a diet that sometimes includes large prey. Their long legs, blunt claws, and non-retractable toes are functional solutions to the same problems, not evidence of kinship. Internally, though, the story changes. Hyena ear structure, skull architecture, and aspects of the reproductive tract reflect their feliform origins.

The Four Living Species

Only four hyena species survive today, which makes Hyaenidae one of the smallest families in Carnivora. Those four species are ecologically and morphologically very different from one another, spanning a range from large cooperative hunters to a solitary termite specialist.²

• Spotted hyena (Crocuta crocuta): The largest and most familiar species, found across sub-Saharan Africa. It lives in large, matriarchal clans that can number over 80 individuals. Spotted hyenas are powerful hunters that regularly take down wildebeest, zebra, and antelope, though they scavenge opportunistically too.
• Striped hyena (Hyaena hyaena): Smaller and more solitary, found from North Africa through the Middle East and into India. It is primarily a scavenger, supplementing carcasses with fruit, insects, and small vertebrates.
• Brown hyena (Parahyaena brunnea): Restricted to southern Africa, it is the rarest of the four. Like the striped hyena, it is mostly a solitary scavenger with a broad, opportunistic diet.
• Aardwolf (Proteles cristata): The outlier. It feeds almost exclusively on termites and has evolved dramatically reduced teeth, an elongated muzzle and tongue, and digestive tract modifications for processing insects rapidly.³

The aardwolf represents the sister lineage to all other living hyenas, diverging less than 10 million years ago. Despite that relatively recent split, its body plan has changed so radically that many people who encounter one do not recognize it as a hyena at all. It weighs roughly 8 to 12 kilograms, a fraction of the spotted hyena’s 45 to 80 kilograms, and its teeth are tiny pegs incapable of cracking bone.

A Once-Vast Family

Four species is a slim showing for a family that once contained dozens of forms across a wide range of body types and ecological niches. During the Miocene and Pliocene, hyenas were among the most diverse predator groups in Africa and Eurasia, filling roles now occupied by wild dogs, wolves, and even large cats. The four surviving species are remnants of that formerly rich radiation.²

One of the more remarkable extinct lineages was Chasmaporthetes, a group of cursorial (running-adapted) hyenas that were the only members of the family to colonize the Americas. Fossils of Chasmaporthetes have been found as far north as the Arctic Circle in Beringia, filling an important gap between Old and New World records of the genus.⁴ These were not the heavy-jawed bone-crushers people associate with modern hyenas. Cranial analyses suggest Chasmaporthetes experienced greater stress from subduing prey than from cracking bones, indicating a more pursuit-oriented lifestyle than today’s spotted hyena.⁵ The extinction of these running hyenas left a gap in North American food webs. No present-day large-bodied hunter-scavenger occupies the niche they once filled.

Deep Time Within the Living Species

Even within the surviving lineages, hyenas carry a surprisingly deep evolutionary history. Molecular clock estimates place the divergence between spotted hyenas and the striped/brown hyena lineage at roughly 10 million years ago, and the common ancestor of all spotted hyena mitochondrial DNA sequences lived about 3.5 million years ago. Within spotted hyenas, distinct genetic clades separated over a million years ago, with Eurasian Pleistocene and modern African populations sharing a common ancestor around 360,000 years ago.⁶ Striped hyenas, by contrast, show a much shallower genetic history, with their most recent common ancestor dated to roughly 340,000 years ago and very little phylogeographic structure across their range.⁷

Brown hyenas have a different kind of genetic story. They harbor extremely low genetic diversity on both mitochondrial and nuclear levels, the result of a long, continuous population decline that began about a million years ago and accelerated sharply toward the end of the Pleistocene.⁸ Despite that bottleneck, researchers have detected evidence of subpopulation structure, which matters for conservation planning because it means the remaining brown hyenas are not genetically uniform. Preserving geographically distinct groups could help maintain what little variation is left.

Spotted Hyena Social Complexity

Taxonomy tells you what an animal is related to, but it does not always predict how an animal lives. Spotted hyenas are a good example. Their social systems rival those of primates in sophistication. Spotted hyena clans are structured by strict linear dominance hierarchies, inherited along the maternal line. Females outrank all immigrant males. Clan members recognize one another individually, form coalitions, and navigate complex social alliances over years or decades. Research on their cognitive abilities has found that the gross anatomy of the spotted hyena brain resembles that of cercopithecine primates in the expansion of the frontal cortex, a region associated with mediating social behavior.⁹

This level of social complexity has consequences for communication. The famous “laugh” or giggle of the spotted hyena is not random noise. Acoustic analysis reveals that the giggle encodes information about the caller’s age, individual identity, and dominance status, giving listeners cues to assess the social position of the animal making the sound.¹⁰ Groans, another common vocalization, also vary by context. Mothers produce more prolonged, more tonal groans with a higher pitch when interacting with cubs than when responding to other stimuli.¹¹

Beyond vocalizations, hyenas rely heavily on chemical signaling. Both spotted and striped hyenas maintain scent-marking glands near the anus, and the volatile fatty acid profiles in those secretions differ between species, between sexes, and even by reproductive state within a single social group. These chemical signals appear to be produced not by the hyenas themselves but by symbiotic fermentative bacteria living in the scent glands, supporting the idea that a community of microbes helps generate the animal’s social odor.¹²

The Spotted Hyena’s Unusual Reproductive Anatomy

One of the most taxonomically disorienting features of the spotted hyena is the female’s reproductive anatomy. Females possess an enlarged clitoris that closely resembles a penis in both size and external appearance, and there is no external vaginal opening. Mating, urination, and birth all occur through this structure.¹³ The internal tract above this point is typical of other carnivorans, with a uterus, vagina, and oviducts, but the birth canal takes a sharp curve through the clitoris, making first-time parturition dangerous for both mother and cub.

Hormonal studies show that a rise in estrogen during female development corresponds to changes in the size and elasticity of the urogenital opening, eventually permitting copulation and birth.¹⁴ Adaptations like extensive smooth muscle in the uterus and vagina, plus a newly described submucosal gland that provides lubrication, help facilitate the passage of large pups through this recurved canal.¹³

This anatomy is unique among mammals and does not appear in any other hyena species. It has no parallel in the dog family. Its evolutionary origins are still debated, but the trait has profoundly shaped how human cultures perceive and classify hyenas for thousands of years.

How Cultures Have Classified Hyenas

Western science places hyenas in Feliformia, but many traditional knowledge systems have wrestled with the same puzzle of what kind of animal the hyena is and arrived at fascinatingly different conclusions. Among the Himba of northwestern Namibia, for example, the hyena occupies a marginal category. Himba herders know from practical experience that hyenas are clever and effective predators, yet culturally they characterize the hyena as stupid. The resolution lies in the perceived hermaphroditic anatomy of the hyena, which places the animal at the boundary of fixed social categories. It is neither cleanly one thing nor another, a creature acting outside its proper bounds.¹⁵

This cultural ambiguity echoes across many African and Middle Eastern traditions. Ancient Greek and Roman writers, too, repeated claims that hyenas could change sex. The spotted hyena’s unusual anatomy made it a perennial target for stories about boundary-crossing and transformation. Understanding the actual taxonomy helps explain why these myths took root: the hyena genuinely does sit at a zoological boundary, looking like a canid while being a feliform, and bearing reproductive anatomy unlike any other carnivore.

Ecological Roles and Competition

Spotted hyenas are frequently the most numerous large predator wherever they live, and their ecological interactions with other carnivores have been studied extensively. In many African ecosystems, the primary competitive dynamic is between spotted hyenas and lions. Researchers studying reintroduced populations in South Africa’s Addo Elephant National Park found that, contrary to expectations, lions and hyenas did not partition their activity times to avoid each other, probably because population densities were still low enough that direct encounters were rare.¹⁶

Hyenas also interact with smaller predators. Kleptoparasitism, where hyenas steal kills from other species, is well documented. African wild dogs are sometimes described as major victims of this dynamic, and some studies have found that wild dogs avoid areas with high hyena densities or shift their activity to times when hyenas are less active. But the picture is not uniform. A study in Hluhluwe-iMfolozi Park found no evidence that wild dogs avoided hyenas either spatially or temporally, suggesting the impact of kleptoparasitism varies with local conditions.¹⁷

Disease Resistance and What It Suggests About Hyena Biology

A final piece of the taxonomic puzzle has practical implications for wildlife health. Spotted hyenas descend from carrion-feeding ancestors, and their immune systems appear to reflect that heritage. They have been documented surviving anthrax and rabies infections, and they have weathered outbreaks of several viral diseases that devastated populations of other carnivores sharing the same habitats.¹⁸ Evolutionary theory predicts exactly this: animals specialized for scavenging should evolve robust defenses against microbial threats encountered through food. Understanding how hyena immune function differs from that of other carnivorans could have implications well beyond hyena taxonomy, potentially illuminating how pathogen exposure shapes immune system evolution across mammals.

Researchers have been developing tools to study hyena immunology in more detail, including assays to measure antibody responses. The work is still in relatively early stages compared to what is available for domestic carnivores like dogs and cats, partly because hyenas have historically been understudied and partly because their unusual phylogenetic position means tools developed for closely related species do not always transfer cleanly. That gap itself is a consequence of taxonomy: because hyenas fall in a relatively isolated spot on the carnivore family tree, without a close domesticated relative, the research infrastructure has been slower to develop.