The evolution of the lion (Panthera leo) is a fascinating journey that traces back millions of years, beginning with early feline ancestors and culminating in the iconic big cat we know today. From the ancient origins of the Felidae family to the rise of the Panthera genus and the global spread of lions across continents, the evolutionary history of lions reflects adaptation to diverse habitats, changes in climate, and complex interactions with other species. Let’s take a detailed look at how lions evolved over millions of years and became one of the most widely recognized predators on Earth.
Lion waiting in Namibia
Origins of the Felidae Family
The story of the lion’s evolution begins with the Felidae family, which includes all cats, both big and small. This family first emerged around 25 million years ago during the Oligocene epoch. These early felines evolved in Asia and eventually spread to other continents.
The Felidae family branched out into various genera, adapting to different environmental conditions and prey sources. Over millions of years, some of these lineages evolved into the specialized predators we recognize today.
Key Traits of Early Felids
Early felids developed traits like retractable claws, sharp teeth, and strong muscular bodies, which made them skilled hunters.
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The Emergence of Panthera leo
The lion (Panthera leo) is a large cat of the genus Panthera, currently found only in Sub-Saharan Africa and India. It has a muscular, broad-chested body; a short, rounded head; round ears; and a dark, hairy tuft at the tip of its tail. The English word lion is derived via Anglo-Norman liun from Latin leōnem (nominative: leō), which in turn was a borrowing from Ancient Greek λέων léōn.
The lion is a muscular, broad-chested cat with a short, rounded head, a reduced neck, and round ears; males have broader heads. The fur varies in colour from light buff to silvery grey, yellowish red, and dark brown. The colours of the underparts are generally lighter. A new-born lion has dark spots, which fade as the cub reaches adulthood, although faint spots may still be seen on the legs and underparts. The tail of all lions ends in a dark, hairy tuft that, in some lions, conceals an approximately 5 mm (0.20 in)-long, hard "spine" or "spur" composed of dermal papillae. The functions of the spur are unknown.
It is sexually dimorphic; adult male lions are larger than females and have a prominent mane. The male lion's mane is the most recognisable feature of the species. It may have evolved around 320,000-190,000 years ago. It grows downwards and backwards, covering most of the head, neck, shoulders, and chest. This feature likely evolved to signal the fitness of males to females. Males with darker manes appear to have greater reproductive success and are more likely to remain in a pride for longer. They have longer and thicker hair and higher testosterone levels, but they are also more vulnerable to heat stress. Unlike in other felid species, female lions consistently interact with multiple males at once. Another hypothesis suggests that the mane also serves to protect the neck in fights, but this is disputed.
The white lion is a rare morph with a genetic condition called leucism, which is caused by a double recessive allele. It is not albino; it has normal pigmentation in the eyes and skin. White lions have occasionally been encountered in and around Kruger National Park and the adjacent Timbavati Private Game Reserve in eastern South Africa. They were removed from the wild in the 1970s, thus decreasing the white lion gene pool.
Lion Subspecies and Genetic Diversity
In the 19th and 20th centuries, several lion type specimens were described and proposed as subspecies, with about a dozen recognised as valid taxa until 2017. Between 2008 and 2016, IUCN Red List assessors used only two subspecific names:
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- P. l. leo for African lion populations.
- P. l. melanochaita for lion populations in East and Southern African regions.
However, there seems to be some degree of overlap between both groups in northern Central Africa. DNA analysis from a more recent study indicates that Central African lions are derived from both northern and southern lions, as they cluster with P. leo leo in mtDNA-based phylogenies whereas their genomic DNA indicates a closer relationship with P. l. melanochaita.
Genetic evidence revealed numerous mutations in lion samples from East and Southern Africa, which indicates that this group has a longer evolutionary history than genetically less diverse lion samples from Asia and West and Central Africa. A whole genome-wide sequence of lion samples showed that samples from West Africa shared alleles with samples from Southern Africa, and samples from Central Africa shared alleles with samples from Asia.
Researchers, therefore, assume Ethiopia is a contact zone between the two subspecies. Genome-wide data of a wild-born historical lion sample from Sudan showed that it clustered with P. l. leo in mtDNA-based phylogenies, but with a high affinity to P. l. melanochaita.
Pleistocene Lions: Cave Lions and Other Extinct Species
P. fossilis was larger than the modern lion and lived in the Middle Pleistocene. P. spelaea, or the cave lion, lived in Eurasia and Beringia during the Late Pleistocene. It became extinct due to climate warming or human expansion latest by 11,900 years ago.
Bone fragments excavated in European, North Asian, Canadian and Alaskan caves indicate that it ranged from Europe across Siberia into western Alaska. It likely derived from P. fossilis. Additionally, in 1938 paleontologist Paulus Deraniyagala named a subspecies P. l. sinhaleyus based on two fossils, a lower left carnassial and a damaged right lower canine tooth, both excavated from deposits in Kuruwita, Sri Lanka.
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Estimates for the divergence time of the modern and cave lion lineages range from 529,000 to 392,000 years ago based on mutation rate per generation time of the modern lion. There is no evidence for gene flow between the two lineages, indicating that they did not share the same geographic area. The Eurasian and American cave lions became extinct at the end of the last glacial period without mitochondrial descendants on other continents.
Thirty-thousand years ago, different types of lions prowled the globe, hunting prey on four continents. One of the most prolific, the cave lion, roamed from Spain all the way through Eurasia and into modern-day Alaska and the Yukon and was widely depicted in prehistoric cave art.
Meanwhile, the American lion, which was even larger than African lions and saber-toothed tigers, lurked throughout North America and possibly parts of South America. Other lions of various sizes and appearances inhabited Africa, the Middle East, and India.
The paper “looks into the past to inform the future,” says co-author Ross Barnett, a geneticist with the University of Copenhagen. “If you were to just look at the lions around today, you’d miss the story.”
Cave lions came out first, splitting from their African kin about 500,000 years ago, according to the paper. These lions then evolved slightly different characteristics. For example, we know “from good cave art in Europe that the males didn’t have manes,” Barnett says. They spread throughout Eurasia, and into North America.
Surprisingly, though, cave lions and ancestors of today’s African lions didn’t interbreed, the genetic analysis reveals. That’s odd because most big cats are known to occasionally mate when given the chance-even very different animals, like lions and tigers, says study co-author Marc de Manuel, with the Institute of Evolutionary Biology in Barcelona.
It seems likely, then, that there was something preventing them from mixing-and not just geography, since their ranges overlapped for a while in southwestern Asia.
Barnett says this may have been because cave lions did not have manes, which female African lions recognize as important signals of fitness and virility. Possibly, then, other types of lions didn’t view the male cave lions as viable mates, he says.
De Manuel and coworkers estimate that the cave lions diverged from modern lions around 500,000 years ago. Their data do not show any evidence of gene flow into cave lions from modern lions after their divergence. This is a bit of an idiosyncracy in comparison to the broader picture of cat phylogeny, which has extensive ancient hybridization among lineages.
A half million years of genetic diversification for cave lions and modern lions is not enough to account for the fossil record of cave lions. Some cave lions have been around since the Early Pleistocene. I would guess that there were multiple dispersals of lions that may have been accompanied by introgression.
Many of the authors of this new paper were also authors of a paper describing the mitochondrial genome of the same Yukon cave lion specimen back in 2016. That paper was “Mitogenomics of the Extinct Cave Lion, Panthera spelaea (Goldfuss, 1810), Resolve its Position within the Panthera Cats” by Barnett and coworkers. In that paper, they provided a divergence date for cave lions and modern lions at 1.89 million years ago. Now, the comparisons of the nuclear genome suggest a much more recent date.
At this point in history, we all know that initial mtDNA comparisons between species may look quite different from later, more complete comparisons using the nuclear genome. Sometimes the divergence of mtDNA appears disproportionately great, Denisovans being an obvious example. This case with the cave lion is a big difference, and it reminds me of the differences we saw early on between chimpanzee mtDNA divergence and the first nuclear genome comparisons.
The difference matters to interpreting the cave lion fossil record, which extends much older than a half million years. De Manuel and coworkers do examine the discrepancy between mtDNA and nuclear comparisons to some degree. They mention in their supplement that previous attempts to date the divergence of cave lions and modern lions used the first appearance date of cave lions in Europe as a calibration point, while this study does not.
On the whole, though, I’d like to see a fuller consideration of these different sets of data. The present sample of lion genome diversity is not yet enough to evaluate whether today’s lions may retain small contributions from divergent populations that may once have existed.
Recent Evolutionary History and Population Divergence
The modern lion was probably widely distributed in Africa during the Middle Pleistocene and started to diverge in sub-Saharan Africa during the Late Pleistocene. Lion populations in East and Southern Africa became separated from populations in West and North Africa when the equatorial rainforest expanded 183,500 to 81,800 years ago.
They shared a common ancestor probably between 98,000 and 52,000 years ago. Due to the expansion of the Sahara between 83,100 and 26,600 years ago, lion populations in West and North Africa became separated.
Another migration and separation occurred when the ancestors of Asiatic lions split off about 70,000 years ago. These lions once ranged from Saudi Arabia to India.
As the rainforest decreased and thus gave rise to more open habitats, lions moved from West to Central Africa. Extinction of lions in southern Europe, North Africa and the Middle East interrupted gene flow between lion populations in Asia and Africa.
The deepest divergence within modern lions was between the northern and southern lineages, which shared an ancestor ca. 70,000 y ago. This severe population bottleneck in the northern genetic lineage suggests that regions north of the Sahara were populated by only a few migrants from the southern lineage at some point in the Late Pleistocene.
This new study provides unparalleled detail of the evolutionary history of the lion, showing relationships between different modern geographic populations and even extinct populations.
The results support the idea that lions radiated out of Africa in a series of migrations, somewhat analogous to humans.
Habitat and Distribution
African lions live in scattered populations across sub-Saharan Africa. The lion prefers grassy plains and savannahs, scrub bordering rivers, and open woodlands with bushes. It rarely enters closed forests. On Mount Elgon, the lion has been recorded up to an elevation of 3,600 m (11,800 ft) and close to the snow line on Mount Kenya. Savannahs with an annual rainfall of 300 to 1,500 mm (12 to 59 in) make up the majority of lion habitat in Africa, estimated at 3,390,821 km2 (1,309,203 sq mi) at most, but remnant populations are also present in tropical moist forests in West Africa and montane forests in East Africa.
The Asiatic lion now survives only in and around Gir National Park in Gujarat, western India. In Asia the lion once ranged in regions where climatic conditions supported an abundance of prey. It was present in the Caucasus until the 10th century. It lived in the Levant until the Middle Ages and in Southwest Asia until the late 19th century.
Lion range map
Social Behavior and Hunting
It is a social species, forming groups called prides. A lion's pride consists of a few adult males, related females, and cubs. The lion is the most social of all wild felid species, living in groups of related individuals with their offspring. Such a group is called a "pride". Groups of male lions are called "coalitions".
Groups of female lions usually hunt together, preying mostly on medium-sized and large ungulates. The lion is a generalist hypercarnivore and is considered to be both an apex and keystone predator due to its wide prey spectrum. Its prey consists mainly of medium-sized to large ungulates, particularly blue wildebeest, plains zebra, African buffalo, gemsbok and giraffe.
Although lions can be active at any time, their activity generally peaks after dusk with a period of socialising, grooming, and defecating. Intermittent bursts of activity continue until dawn, when hunting most often takes place.
Young lions first display stalking behaviour at around three months of age, although they do not participate in hunting until they are almost a year old and begin to hunt effectively when nearing the age of two. Single lions are capable of bringing down zebra and wildebeest, while larger prey like buffalo and giraffe are riskier.
A lion may switch lifestyles; nomads can become residents and vice versa. Interactions between prides and nomads tend to be hostile, although pride females in estrus allow nomadic males to approach them.
Lions spend much of their time resting; they are inactive for about twenty hours per day.
Conservation Status and Threats
During the Neolithic period, the lion ranged throughout Africa and Eurasia, from Southeast Europe to India, but it has been reduced to fragmented populations in sub-Saharan Africa and one population in western India. It has been listed as Vulnerable on the IUCN Red List since 1996 because populations in African countries have declined by about 43% since the early 1990s. Lion populations are untenable outside designated protected areas.
Over the past 150 years, the global population of African lions has declined by more than 20-fold to fewer than 25,000, mostly due to hunting and habitat loss.
North African subspecies, the Barbary lion and the Cape Province lion, disappeared within the last century and a half, and they have all but disappeared from Eurasia since their apex during the late Pleistocene ice age when cave lions were dispersed from Iberia to Alaska.
As part of the study, the researchers assembled genomes of individuals from three other extinct lineages: Barbary lions of North Africa; Middle Eastern lions; and Cape lions of South Africa. All three had slight variations in appearance, though the new genetic information shows they don’t qualify as different species.
Now, the small, isolated population in western India's Gir Forest is all that’s left, says Steve O’Brien, a research scientist with Nova Southeastern University.
Thanks to conservation efforts, the population has expanded nearly threefold since the 1990s, but the population is highly inbred, with a low level of genetic diversity. As a result, male Asiatic lions have malformed sperm and testosterone levels about 10 times lower than those of African lions, O’Brien says.
