Hyena
Feliform mammals vital to African ecosystems, with unique scavenging adaptations.
Hyenas (or hyaenas) are feliform carnivoran mammals belonging to the family Hyaenidae. With only four extant species, each in its own genus, they are the fifth-smallest family in the order Carnivora and one of the smallest in the class Mammalia. Despite their low diversity, hyenas are unique and vital components of most African ecosystems.
- Classification
- Feliform carnivoran mammals, family Hyaenidae
- Extant species
- 4 (striped hyena, brown hyena, spotted hyena, aardwolf)
- Earliest known ancestor
- Plioviverrops, 20–22 million years ago
- Origin
- Miocene Eurasia
- Key adaptation
- Bone-crushing dentition in some species; insectivorous diet in aardwolf
Lore & Background
Hyenas originated in the jungles of Miocene Eurasia 22 million years ago, when most early feliform species were still largely arboreal. The first ancestral hyenas were likely similar to the modern African civet; one of the earliest species described, Plioviverrops, was a lithe, civet-like animal that inhabited Eurasia 20–22 million years ago. The lineage of Plioviverrops prospered and gave rise to descendants with longer legs and more pointed jaws, a direction similar to that taken by canids in North America. Hyenas then diversified into two distinct types: lightly built dog-like hyenas and robust bone-crushing hyenas. The dog-like hyenas thrived 15 million years ago, with more than 30 species identified, but most became extinct after a change in climate and the arrival of canids into Eurasia. Only the insectivorous aardwolf survived from that lineage. The bone-crushing hyenas, including the extant spotted, brown, and striped hyenas, became the undisputed top scavengers of Eurasia and Africa.
Reader's Guide
Hyenas are significant for their unique evolutionary history and ecological roles. They originated in Miocene Eurasia and diversified into dog-like and bone-crushing forms. The dog-like hyenas declined due to climate change and competition from canids, leaving only the aardwolf, which survived by specializing on termites. The bone-crushing hyenas became dominant scavengers, feeding on large herbivore carcasses felled by sabre-toothed cats. The spotted hyena evolved social behaviors and pack hunting in response to competition. Hyenas feature prominently in human folklore, often viewed as frightening and associated with witchcraft, grave robbing, and theft. Genomic studies reveal expansions in olfactory receptor genes in all four extant species, immune-related gene families in scavenging species, and toxin-response genes in the aardwolf, reflecting their specialized feeding habits. Their legacy includes being vital components of African ecosystems and subjects of cultural mythology.
Did You Know?
- Hyenas are phylogenetically closer to felines and viverrids than to canids, but convergent evolution makes them behaviorally and morphologically similar to canids.
- The aardwolf is the only surviving member of the dog-like hyena lineage, tracing its lineage directly back to Plioviverrops 15 million years ago.
- The spotted hyena's direct ancestor was Crocuta sivalensis, which lived during the Villafranchian period.
Frequently Asked Questions
What are hyenas?
Hyenas are a small group of feliform carnivorous mammals that form the family Hyaenidae. They are best known for their powerful bone-crushing jaws and scavenging lifestyle, yet they are actually more closely related to cats than to dogs despite their canid-like build.
How many living hyena species are there?
There are exactly four extant species, each in its own genus: the striped hyena, brown hyena, spotted hyena, and aardwolf. This low diversity makes Hyaenidae the fifth-smallest family in the order Carnivora.
Where did hyenas evolve from and when?
The lineage traces back to the Miocene in Eurasia, with the earliest recognized ancestor being Plioviverrops, roughly 20 to 22 million years old. From that early stock, the group radiated into the four species we recognize today, mostly across Africa.
Why are hyenas important to African ecosystems?
They function as both predators and efficient scavengers, clearing carrion and helping regulate prey populations across most African habitats. Their specialized dentition lets them extract nutrients from bones that other carnivores cannot process, making them a keystone part of the food web.
What sets the aardwolf apart from the other three hyenas?
The aardwolf is primarily insectivorous, feeding almost exclusively on termites rather than meat or carrion. This dietary shift distinguishes it sharply from the striped, brown, and spotted hyenas, all of which are more conventionally carnivorous.
More in Mammals 25-40
Elsewhere in the Mammals universe
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record