Lion

• 1. Introduction

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  Panthera leo, the lion, holds a peculiar distinction among Earth's great predators: no other animal has been so thoroughly woven into the human story while simultaneously being pushed to the edge of its former territory. Once roaming from Southeast Europe to India and across Africa's broadest expanses, the lion today survives in two isolated pockets, one across sub-Saharan Africa and one small population in western India. Since 1996, the IUCN has listed it as Vulnerable, and in the decades since the early 1990s, African populations have fallen by roughly 43%. What drove one of the planet's most capable hunters to this fragmented existence? And what does the lion's remarkable biology, its social architecture, its centuries of entanglement with human power, tell us about how it got here? Those questions carry us through the chapters that follow.

• 2. An Ancient Lineage

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  The earliest fossils recognisable as lions were found at Olduvai Gorge in Tanzania and are estimated to be up to 2 million years old. The Panthera lineage itself diverged from the common ancestor of all cats far earlier, and hybridisation between lion and snow leopard ancestors possibly continued until about 2.1 million years ago. Two now-extinct relatives once shared the planet with the ancestors of modern lions. P. spelaea, the cave lion, ranged across Eurasia and into Beringia during the Late Pleistocene and was genetically isolated and highly distinct from modern lions. It became extinct due to climate warming or human expansion no later than 11,900 years ago. P. atrox, the American lion, diverged from the cave lion around 165,000 years ago and ranged from Canada south to possibly Patagonia before it too vanished. The modern lion diverged from the cave lion lineage somewhere between 529,000 and 392,000 years ago, based on mutation rates per generation time. Modern lion populations in East and Southern Africa split from those in the west and north when an expansion of equatorial rainforest divided the continent between 183,500 and 81,800 years ago. A later expansion of the Sahara, between 83,100 and 26,600 years ago, further separated West and North African populations. As the rainforest eventually contracted, lions moved from West into Central Africa. By the early Holocene, some North African lions had dispersed northward into southern Europe and east into Asia, with that dispersal dated between 38,800 and 8,300 years ago. Central Africa, it turns out, served as a genetic melting pot where isolated populations mingled again, possibly migrating through corridors along the Nile Basin.

• 3. Body Built for the Kill

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  Skeletal muscles make up 58.8% of a lion's body weight, the highest proportion recorded among mammals. Paired with a high concentration of fast-twitch muscle fibres, this gives the lion explosive short-distance speed but limited stamina. A 2018 study recorded a top speed of 74.1 km/h, and analysis of hunting films measured an initial acceleration of 9.5 m/s2, compared with 4.5 m/s2 for a Thomson's gazelle. That gap matters: the gazelle can reach nearly 97 km/h, well beyond the lion's 50 km/h cruising pace, so the lion's strategy depends on stealth and closing distance before prey can react. Lions studied in Queen Elizabeth National Park raised their odds of success significantly when hunting on moonless nights, attacking from within 20 m and through grass cover of 80 cm. The lion's heart is comparatively small; a lioness's heart makes up only 0.57% of her body weight, versus nearly 1% for a hyena. This limits sustained pursuit and explains why every hunt is a calculated gamble rather than a chase. When a lion does connect, it brings prey down by the rump and kills with a clamping bite to the throat or muzzle, capable of holding for up to 13 minutes. A lioness generates a bite force of 1593.8 Newtons at the canine teeth. Among all wild felids, the lion is second only to the tiger in body size; adult males in Southern Africa average between 186.55 and 225 kg, while females average between 118.37 and 143.52 kg in the same region.

• 4. The Pride and the Nomad

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  A typical lion pride consists of around 15 individuals, including several adult females, up to four males, and cubs of both sexes, though prides of up to 30 have been observed. Females form the stable core: most remain in their birth pride for life, which is why females in any given area are more closely related to one another than the males are. Adult males, by contrast, lead nomadic lives before gaining residence. A study in Serengeti National Park found that nomadic coalitions typically achieve residency between 3.5 and 7.3 years of age. In Kruger National Park, dispersing males move more than 25 km from their natal pride when searching for territory. Territory quality correlates directly with pride size. A study in a Zimbabwean wildlife reserve found that the dominant pride of 12 lions commanded a home range of 130.35 km2, with the shortest average distance to water. The smallest pride of four lions had the largest home range, 174.6 km2, and the longest trek to water. Asiatic lion prides are structured differently. Male Asiatic lions are typically solitary or associate with up to three others, while females form separate groupings of up to 12, and the sexes associate mainly when mating. When new males oust the resident males from an African pride, the victors often kill existing cubs, because females do not become sexually receptive again until their offspring mature or die. Females resist, but rarely succeed unless three or four mothers act together.

• 5. Hunting, Competition and Diet

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  Blue wildebeest, plains zebra, African buffalo, gemsbok, and giraffe make up the core of the African lion's diet. In India, chital and sambar deer are the primary wild prey, though livestock accounts for a significant share of kills outside protected areas. Lions are hypercarnivores and generalist predators, yet carrion is thought to provide a substantial part of their overall diet. Scavenging lions watch constantly for circling vultures, which signal a carcass. Most shared carrion is actually killed by spotted hyenas rather than lions. The relationship between the two species is contentious. Across several studies, dietary overlap between lions and spotted hyenas stands at 58.6%. In the Ngorongoro crater, lions subsist largely on hyena kills; in Botswana's Chobe National Park, the balance reverses, with hyenas obtaining food from 63% of all lion kills. Lions can account for up to 71% of hyena deaths in Etosha National Park. Cheetahs and leopards also compete with lions and consistently lose. A study in the Serengeti ecosystem found that lions killed at least 17 of 125 cheetah cubs born between 1987 and 1990. An adult lioness needs roughly 5 kg of meat per day, a male about 7 kg, but lions gorge opportunistically, consuming up to 30 kg in a single session. Cubs suffer most when food is scarce, though old and crippled pride members also manage to eat their fill from large kills that are shared more broadly.

• 6. The Mane and What It Signals

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  The male lion's mane may have evolved between 320,000 and 190,000 years ago. It grows downward and backward across the head, neck, shoulders, and chest, and takes its full size at around four years old. Mutations in the genes for microphthalmia-associated transcription factor and tyrosinase are possibly responsible for mane colour. Males with darker manes show greater reproductive success and tend to remain with prides longer. They also carry higher testosterone levels and longer, thicker hair, but pay a price: they are more vulnerable to heat stress. Cooler ambient temperatures in European and North American zoos tend to produce heavier manes. In Pendjari National Park, almost all male lions are maneless or have very short manes, and maneless males have also been recorded in Senegal, in Sudan's Dinder National Park, and in Kenya's Tsavo East National Park. Castrated lions develop little or no mane because testosterone production is suppressed. In northern Botswana, some lionesses have been observed with manes, with increased testosterone cited as a likely cause. A competing theory suggests the mane helps protect the neck during fights, but the evidence does not strongly support this: during fights involving even maneless females and adolescents, the neck is targeted less frequently than the face, back, and hindquarters. A tail feature smaller but equally distinctive is the dark tuft at the tip, which in some lions conceals a hard spine roughly 5 mm long composed of dermal papillae. Its function is unknown. The tuft itself is absent at birth and becomes clearly identifiable by seven months of age.

• 7. Shrinking Range, Fragile Futures

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  In the 1960s, the lion was declared extinct in North Africa, except for remnant animals in the southern part of Sudan. The last confirmed live lion in Iran was sighted in 1942, roughly 65 km northwest of Dezful; a lioness's corpse was found on the banks of the Karun river in Khuzestan province in 1944. In Africa, estimates of the wild population between 2002 and 2004 ranged between 16,500 and 47,000 individuals. By 2015, the West African population had been reduced to about 400 animals, fewer than 250 of them mature, persisting in three protected areas. The largest of these is the W-A-P complex shared by Benin, Burkina Faso, and Niger. This population is listed as Critically Endangered. Cameroon's Waza National Park held between approximately 14 and 21 lions as of 2009. In 2015, two lions sighted in Ghana's Mole National Park were the first recorded there in 39 years. That same year, a population of up to 200 lions previously thought gone was filmed in Ethiopia's Alatash National Park, near the Sudanese border. The Asiatic lion tells a different story. Confined to Gir National Park in Gujarat and its surrounding areas, a total of 1412 km2, the population grew from approximately 180 individuals in 1974 to about 523 by 2015, and roughly 650 were recorded during the 2017 Asiatic Lion Census. Geographic isolation, however, increases the risk of inbreeding and reduced genetic diversity. Man-eating is a related pressure point in Tanzania: American and Tanzanian scientists documented a sharp increase in attacks on people in rural areas from 1990 to 2005, with at least 563 villagers attacked. The incidents clustered near Selous Game Reserve and in Lindi Region, and a separate study of 1,000 attacks in southern Tanzania between 1988 and 2009 found that the weeks following the full moon, when nights are darkest, were a strong predictor of increased attacks on people.

• 8. Kings in Culture

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  Around 4,000 years ago, the Sumerians recognised the constellation Leo, the fifth sign of the zodiac. That deep familiarity with the lion as a cosmic symbol hints at how long humans have placed the animal at the centre of their world. Pharaoh Amenhotep III recorded killing 102 lions in ten years with his own arrows, in an inscription dated to approximately 1380 BC. The Assyrian emperor Ashurbanipal had one of his hunts recorded in a sequence of palace reliefs around 640 BC, known as the Lion Hunt of Ashurbanipal. Lions decorate the Processional Way leading to the Ishtar Gate in Babylon, built by Nebuchadnezzar II in the 6th century BCE. In India, Emperor Ashoka erected the Lion Capital in the 3rd century BCE, a monument depicting four lions standing back to back that now serves as India's national emblem. In England, lions were kept at the Tower of London in a menagerie established by King John in the 13th century, a collection that possibly extended an earlier one started in 1125 by Henry I at his hunting lodge in Woodstock, Oxfordshire. Lion taming entered European circus life in the early 19th century through Frenchman Henri Martin and American Isaac Van Amburgh, whose techniques spread widely. The lion tamer's chair was possibly first used by American Clyde Beatty, born 1903 and died 1965. In literature, the lion figures as the Cowardly Lion in L. Frank Baum's 1900 The Wonderful Wizard of Oz, as Aslan in C. S. Lewis's The Lion, the Witch and the Wardrobe, and as the central figure of the 1994 Disney animated feature The Lion King. The Maasai have historically regarded the killing of a lion as a rite of passage, a tradition that persists even as elders increasingly discourage solo hunts because wild populations can no longer absorb the loss.