Elephants’ closest living relatives are hyraxes and manatees, two animals that look nothing like them. Hyraxes are small, rodent-like creatures that perch on rocky outcrops in Africa and the Middle East, while manatees are slow-moving aquatic herbivores found in warm coastal waters. The connection among these three groups was suspected for over a century on anatomical grounds, but it took DNA analysis in the late twentieth century to confirm it and to reveal an even wider circle of unlikely kin, including aardvarks, tenrecs, golden moles, and elephant shrews.
Hyraxes and Manatees, the Closest Living Kin
Elephants, hyraxes, and sirenians (the group containing manatees and dugongs) form a clade called Paenungulata. The nineteenth-century zoologist George Gaylord Simpson grouped them together based on skeletal similarities, and molecular studies have since confirmed the arrangement. Hemoglobin sequence comparisons identified shared amino acid changes at multiple sites that unite elephants, hyraxes, and manatees into a single evolutionary branch, distinct from other mammals.1PubMed. Paenungulata: a comparison of the hemoglobin sequences from elephant, hyrax, and manatee Chromosome-painting studies later added further support, finding at least 11 shared chromosomal rearrangements unique to the three groups.2PubMed Central. Chromosome painting among Proboscidea, Hyracoidea and Sirenia: support for Paenungulata (Afrotheria, Mammalia) but not Tethytheria
Despite the DNA evidence, figuring out which two of the three are most closely related has been difficult. One phylogenetic analysis based on both molecular and anatomical data places sirenians as the outgroup, making hyraxes the closest living relatives of elephants.3Zoologica Scripta. Phylogeny and conservation priorities of afrotherian mammals (Afrotheria, Mammalia) Other studies have favored a hyrax-sirenian pairing or have found the three-way split too close to resolve cleanly. This ambiguity reflects the reality that the three lineages diverged from one another in a relatively short evolutionary window, leaving few molecular breadcrumbs to trace the exact branching order.
What Hyraxes and Elephants Actually Share
Hyraxes weigh a few kilograms, have no trunk, and at first glance could pass for large guinea pigs. So what connects them to elephants beyond DNA? A handful of anatomical quirks turn up in both lineages. Hyraxes have toenails rather than claws, flattened and hoof-like on their hind feet, resembling the nails of elephants more than those of typical small mammals. Both have upper incisors that grow continuously (in elephants these became tusks; in hyraxes they form small, pointed tusks of their own). Their teeth also share structural similarities in enamel microstructure. And both have relatively long gestation periods for their body sizes: a hyrax carries its young for about seven to eight months, far longer than comparably sized rodents.
Manatees and elephants share a different set of parallels. Both are herbivores with a pattern of tooth replacement in which worn molars are pushed forward and shed, replaced by new teeth emerging from the back of the jaw. In elephants this “conveyor belt” system cycles through six sets of molars over a lifetime. Manatees do something strikingly similar, though the two lineages evolved the trait independently from their common ancestor’s simpler dentition. Both also have thick, wrinkled skin and relatively sparse body hair, though in the manatee’s case the skin has adapted to aquatic life.
The Wider Family Nobody Expected
Paenungulata sits inside an even larger group called Afrotheria, and this is where elephant family trees become genuinely surprising. Afrotheria includes not just elephants, hyraxes, and sirenians, but also aardvarks, elephant shrews (also called sengis), tenrecs, and golden moles.4PubMed Central. Early Tertiary mammals from North Africa reinforce the molecular Afrotheria clade An aardvark is a nocturnal, ant-eating animal with rabbit ears and a pig snout. Tenrecs are small, spiny insectivores from Madagascar. Golden moles are blind, burrowing mammals that look like actual moles but are unrelated to them. The idea that these animals share a common ancestor with elephants would have seemed absurd to zoologists a few decades ago.
Molecular evidence pulled these unlikely cousins together. Studies in the late 1990s showed that tenrecs and golden moles, long classified in the catch-all order Insectivora alongside hedgehogs, shrews, and true moles, actually belong to an entirely different evolutionary branch rooted in Africa.5PubMed. Molecular evidence for multiple origins of Insectivora and for a new order of endemic African insectivore mammals The results forced scientists to break up Insectivora and move the two African families into Afrotheria. Retroposon analysis later confirmed the grouping, showing that aardvarks and the tenrec-golden mole branch are closely related to each other, with elephant shrews as a sister group to both.6Molecular Biology and Evolution. A Retroposon Analysis of Afrotherian Phylogeny
Within Afrotheria, the internal structure looks roughly like this: Paenungulata (elephants, hyraxes, sirenians) forms one branch. A second branch holds aardvarks alongside Afrosoricida (tenrecs and golden moles). Elephant shrews sit as a sister to that second branch. All of these lineages share deep common ancestry but diverged tens of millions of years ago, which is why they ended up looking so different from one another.
How DNA Rewrote Elephant Taxonomy
Afrotheria was not recognized as a group until the 1990s, when molecular phylogenetics transformed mammalian classification. Before that, scientists sorted animals primarily by anatomy, and the members of Afrotheria are so physically diverse that nobody had grounds to lump them together.7Current Biology. Afrotheria Tenrecs were filed with hedgehogs. Golden moles were filed with true moles. Elephant shrews were sometimes placed near rabbits, sometimes near actual shrews. The anatomical evidence simply did not exist to see the pattern, because 80-plus million years of independent evolution had erased most of the outward similarities.
What the anatomy missed, geography hinted at. All the core afrotherian lineages either live in Africa today or have their deepest fossil roots there. Some molecular clock analyses suggest that Afrotheria originated on the African landmass roughly 100 million years ago, when the breakup of the southern supercontinent Gondwana was isolating Africa from South America.7Current Biology. Afrotheria That long period of geographic isolation gave the ancestral afrotherian stock time to diversify into the wildly different body plans we see today. Fossil discoveries of early afrotherians in North Africa have since added physical evidence supporting the molecular picture.4PubMed Central. Early Tertiary mammals from North Africa reinforce the molecular Afrotheria clade
Mammoths and Mastodons
When people think of elephant relatives, mammoths are usually the first animals that come to mind, and for good reason. Woolly mammoths are among the closest relatives elephants have ever had. Genomic DNA analysis shows that the Asian elephant is the closest living relative of the mammoth, not the African elephant.8PubMed Central. Genomic DNA Sequences from Mastodon and Woolly Mammoth Reveal Deep Speciation of Forest and Savanna Elephants Mitochondrial genome analysis dates the split between mammoths and Asian elephants to roughly 6.7 million years ago, while the ancestors of African elephants diverged from the mammoth-Asian elephant lineage around 7.6 million years ago.9PLoS Biology. Proboscidean Mitogenomics: Chronology and Mode of Elephant Evolution Using Mastodon as Outgroup
Mastodons are a different story. They belong to the family Mammutidae rather than Elephantidae and split from the elephant lineage much earlier, roughly 24 to 28 million years ago.9PLoS Biology. Proboscidean Mitogenomics: Chronology and Mode of Elephant Evolution Using Mastodon as Outgroup Despite the much deeper divergence, fossil DNA from American mastodons has been used as an outgroup to confirm the mammoth-Asian elephant relationship, reinforcing the family tree with independent evidence.10PubMed. Phylogenetic resolution within the Elephantidae using fossil DNA sequence from the American mastodon (Mammut americanum) as an outgroup
Beyond mammoths and mastodons, the order Proboscidea has a fossil record stretching back about 60 million years. It includes gomphotheres, four-tusked animals that once roamed every continent except Australia and Antarctica, and stegodonts, large-bodied animals with tightly packed molar ridges that lived across Asia into the Pleistocene. All of these extinct forms share with modern elephants the hallmark feature of the order: a proboscis, or trunk, in some stage of development.
Elephants from the Water
One of the more striking discoveries about proboscidean history is that the earliest members of the elephant lineage may have been semiaquatic. Stable isotope analysis of two ancient proboscidean genera, Barytherium and Moeritherium, found oxygen isotope signatures matching those of aquatic and semiaquatic mammals rather than land-dwellers.11PubMed Central. Stable isotope evidence for an amphibious phase in early proboscidean evolution These animals, which lived roughly 35 to 37 million years ago in what is now Egypt, had dental shapes suited to grazing on freshwater plants and were found in sediments associated with swamp and riverine environments. The researchers concluded that the simplest reading of the combined evidence is that these early proboscideans lived in freshwater swamps, similar in lifestyle to modern hippos.
This aquatic phase makes the elephant-manatee connection feel less random. If the common ancestor of Paenungulata had some affinity for water, it becomes easier to imagine how one branch could have gone fully aquatic (sirenians), one could have stayed amphibious for a time before returning to land (proboscideans), and one could have moved onto rocky terrain (hyraxes). The fossil record is too sparse to prove this narrative neatly, but the isotope data at least shows that early proboscideans were not the exclusively terrestrial giants we know today.
Desmostylians, the Extinct Marine Relatives
There is one more group of elephant relatives worth knowing about, even though they have been extinct for millions of years. Desmostylians were bizarre, hippo-like marine mammals that lived along the coasts of the North Pacific during the Oligocene and Miocene, roughly 33 to 10 million years ago. For decades, scientists classified them as a branch of Sirenia because of their aquatic habits, but cladistic analysis has repositioned them as more closely related to proboscideans than to sirenians. The reasoning is that desmostylians and proboscideans share a more recent common ancestor than either does with sirenians.12Smithsonian Institution. Two New Oligocene Desmostylians and a Discussion of Tethytherian Systematics
Desmostylians had columnar teeth unlike those of any living mammal, barrel-shaped bodies, and powerful limbs suited for both swimming and walking on shore. The most primitive known desmostylians compare favorably with primitive Eocene proboscideans like Moeritherium, suggesting that the two lineages branched apart at a time when the ancestral body plan was still relatively small and at least partially tied to water. Desmostylians never evolved trunks or tusks, so they would not have looked like elephants in any obvious way, but they represent one of the closest extinct side-branches to the proboscidean family tree outside Elephantidae itself.
Why Elephants Look Nothing Like Their Relatives
The question people naturally ask after learning this family tree is: if these animals are all related, why do they look so different? The answer is time and ecology. The afrotherian lineages have been evolving independently for tens of millions of years, and during that span they adapted to radically different environments. Tenrecs radiated into dozens of species in Madagascar, filling niches occupied elsewhere by hedgehogs, shrews, and even otters. Golden moles adapted to burrowing underground and lost their external eyes entirely. Sirenians became fully aquatic. Elephants grew enormous and developed trunks, tusks, and the largest brains of any land animal. These are not superficial differences; they represent profound remodeling of every body system over geological time.
One of the few physical traits shared broadly across Afrotheria involves reproductive anatomy. Afrotherian placentas tend to form either an equatorial band or a disc shape, and several afrotherian groups have an endotheliochorial placental barrier, where maternal blood vessels are lined by a tissue layer rather than directly bathing fetal tissue.13PubMed. Placentation in species of phylogenetic importance: the Afrotheria Elephants, aardvarks, and possibly sirenians share this placental type, while the smaller afrotherians have a different arrangement. These are not traits you can observe at a zoo, which is part of why the grouping eluded anatomists for so long. The kinship between an elephant and a tenrec is written in molecular sequences and in subtle internal structures, not in anything visible from the outside.
The Conveyor-Belt Mouth
One of the more remarkable features elephants share with some of their extinct relatives is their system of tooth replacement. Rather than having a full set of adult teeth that last a lifetime, elephants cycle through six sets of molars. New teeth emerge at the back of the jaw, gradually push forward as they grow, and replace worn teeth at the front, which fragment and fall out. This horizontal conveyor-belt mechanism is not found in most mammals but is shared across elephantiform proboscideans, including mastodons, gomphotheres, and stegodonts. The earliest evidence for this specialized dental system dates to the late Oligocene, about 26 million years ago.14Historical Biology. Horizontal tooth displacement and premolar occurrence in elephants and other elephantiform proboscideans
Modern elephants have taken this system to an extreme by losing their permanent premolars entirely. The three living species have no premolars at all, relying solely on the molar conveyor belt for chewing. More primitive proboscideans retained premolars alongside the horizontal replacement system. The progressive loss of premolars over evolutionary time reflects a shift toward processing increasingly tough, fibrous plant material, where massive grinding surfaces mattered more than a varied tooth toolkit. When the sixth and final set of molars wears out in a modern elephant, the animal can no longer feed effectively, which is one reason very old elephants often gravitate toward softer vegetation in swampy areas.
Elephant Shrews Are Not What They Sound Like
Elephant shrews, or sengis, deserve a special mention because their common name creates confusion. They are not shrews, and they are not elephants, but they are genuine members of Afrotheria and therefore more closely related to elephants than they are to actual shrews. The name “elephant shrew” comes from their elongated, flexible snouts, which vaguely recall a miniature trunk. Sengis are small, fast-moving insectivores found across Africa, and some species can sprint at speeds that seem absurd for their size, using dedicated trail networks they maintain through the undergrowth.
Despite looking like oversized mice with long noses, sengis have been reshuffled taxonomically multiple times. They were once placed near rabbits, then near various insectivore groups, before molecular data finally anchored them in Afrotheria as a sister group to the aardvark-tenrec-golden mole cluster.6Molecular Biology and Evolution. A Retroposon Analysis of Afrotherian Phylogeny Their placement is a good illustration of how convergent evolution can mislead anatomical classification: animals that independently evolve similar body shapes for similar lifestyles can end up being filed together even when their actual ancestry is very different. Sengis look like shrews because they fill a similar ecological role, not because they share recent common ancestors with them.