The lion ( Panthera leo) is a large Felidae of the genus Panthera, native to 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. It is sexually dimorphic; adult male lions are larger than females and have a prominent mane. It is a social species, forming groups called prides. A lion's pride consists of a few adult males, related females, and cubs. Groups of female lions usually hunt together, preying mostly on medium-sized and large . The lion is an apex predator and keystone predator.
The lion inhabits , , and . It is usually more diurnality than other wild cats, but when persecuted, it adapts to being active nocturnality and crepuscular. 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. Although the cause of the decline is not fully understood, habitat loss and conflicts with humans are the greatest causes for concern.
One of the most widely recognised animal symbols in human culture, the lion has been extensively depicted in sculptures and paintings, on national flags, and in literature and films. Lions have been kept in since the time of the Roman Empire and have been a key species sought for exhibition in zoological gardens across the world since the late 18th century. Cultural depictions of lions have occurred worldwide, particularly as a symbol of power and royalty.
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. leo melanochaita.
Lion samples from some parts of the Ethiopian Highlands cluster genetically with those from Cameroon and Chad, while lions from other areas of Ethiopia cluster with samples from East Africa. 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; this suggested that the taxonomic position of lions in Central Africa may require revision.
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. He called it "narrower and more elongate" but otherwise failed to distinguish P. l. sinhaleyus from other lion subspecies. A subsequent study of felid fossils from the Kuruwita deposits in 2005 described the fossils in further detail but only assigned to them to P. leo.
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 Mitochondrion descendants on other continents. 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. As the rainforest decreased and thus gave rise to more open habitats, lions moved from West to Central Africa. Lions from North Africa dispersed to southern Europe and Asia between 38,800 and 8,300 years ago.
Extinction of lions in southern Europe, North Africa and the Middle East interrupted gene flow between lion populations in Asia and Africa. Genetic evidence revealed numerous 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. This phenomenon indicates that Central Africa was a melting pot of lion populations after they had become isolated, possibly migrating through corridors in the Nile Basin during the early Holocene.
Its skull is very similar to that of the tiger, although the frontal region is usually more depressed and flattened and has a slightly shorter postorbital region and broader nasal openings than those of the tiger. Due to the amount of skull variation in the two species, usually only the structure of the lower jaw can be used as a reliable indicator of species.
The skeletal muscles of the lion make up 58.8% of its body weight and represent the highest percentage of muscles among mammals. The lion has a high concentration of fast twitch muscle fibres, giving them quick bursts of speed but less stamina.
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.Packer, pp. 137, 145. The core body temperature does apparently not increase regardless of sex, season, feeding time, length and colour of mane, but only surface temperature is affected. Unlike in other felid species, female lions consistently interact with multiple males at once.Packer, pp. 145. Another hypothesis suggests that the mane also serves to protect the neck in fights, but this is disputed.Schaller, pp. 360.Packer, pp. 133. During fights, including those involving maneless females and adolescents, the neck is not targeted as much as the face, back, and hindquarters. Injured lions also begin to lose their manes.Packer, pp. 133, 137, 145, 148.
Almost all male lions in Pendjari National Park are either maneless or have very short manes. have also been reported in Senegal, in Sudan's Dinder National Park and in Tsavo East National Park, Kenya. Castration lions often have little to no mane because the removal of the inhibits testosterone production. Rarely, both wild and captive lionesses have manes. Increased testosterone may be the cause of maned lionesses reported in northern Botswana.
During the mid-Holocene, around 8,000-6,000 years ago, the range of lions expanded into Southeastern and Eastern Europe, partially re-occupying the range of the now extinct Panthera spelaea. In Hungary, the modern lion was present from about 4,500 to 3,200 years Before Present. In Ukraine, the modern lion was present from about 6,400 to 2,000 years Before Present. In Greece, it was common, as reported by Herodotus in 480 BC; it was considered rare by 300 BC and Local extinction by AD 100.
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. By the late 19th century, it had been extirpated in most of Turkey. The last live lion in Iran was sighted in 1942, about northwest of Dezful, although the corpse of a lioness was found on the banks of the Karun river in Khuzestan province in 1944. It once ranged from Sind and Punjab in Pakistan to Bengal and the Narmada River in central India.
Nomadic lions range widely and move around sporadically, either in pairs or alone. Pairs are more frequent among related males. 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.Schaller, pp. 52–54. Males spend years in a nomadic phase before gaining residence in a pride. A study undertaken in the Serengeti National Park revealed that nomadic coalitions gain residency at between 3.5 and 7.3 years of age. In Kruger National Park, dispersing male lions move more than away from their natal pride in search of their own territory. Female lions stay closer to their natal pride. Therefore, female lions in an area are more closely related to each other than male lions in the same area.
The evolution of sociability in lions was likely driven both by high population density and the clumped resources of savannah habitats. The larger the pride, the more high-quality territory they can defend; "hotspots" are near river , where they have optimal access to water, prey and vegetation cover.Packer, pp. 195–196, 222. A study on three lion prides in a Zimbabwean wildlife reserve revealed that the dominant pride of 12 lions had the shortest average distance to water and the smallest home range of ; the smallest pride of four lions had the longest average distance to water and the largest home range of .
The area occupied by a pride is called a "pride area" whereas that occupied by a nomad is a "range". Males associated with a pride patrol the fringes. Both males and females defend the pride against intruders, but the male lion is better-suited for this purpose due to its stockier, more powerful build. Some individuals consistently lead the defence against intruders, while others lag behind. Lions tend to assume specific roles in the pride; slower-moving individuals may provide other valuable services to the group. Alternatively, there may be rewards associated with being a leader that fends off intruders; the rank of lionesses in the pride is reflected in these responses. The male or males associated with the pride must defend their relationship with the pride from outside males who may attempt to usurp them. Dominance hierarchies do not appear to exist among individuals of either sex in African prides.Packer, pp. 42, 57.
Asiatic lion prides differ in group composition. Male Asiatic lions are solitary or associate with up to three males, forming a loose pride while females associate with up to 12 other females, forming a stronger pride together with their cubs. Female and male lions associate only when mating. Coalitions of males hold territory for a longer time than single lions. Males in coalitions of three or four individuals exhibit a pronounced hierarchy, in which one male dominates the others and mates more frequently.
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.Schaller, p. 153. Single lions are capable of bringing down zebra and wildebeest, while larger prey like buffalo and giraffe are riskier. In Chobe National Park, large prides have been observed hunting African bush elephants up to around 15 years old in exceptional cases, with the victims being calves, juveniles, and even subadults. In typical group hunts, each lioness has a favoured position in the group, either stalking prey on the "wing", then attacking, or moving a smaller distance in the centre of the group and capturing prey fleeing from other lionesses. Males attached to prides do not usually participate in group hunting.
Some evidence suggests, however, that males are just as successful as females; they are typically solo hunters who ambush prey in small bushland. They may join in the hunting of large, slower-moving prey like buffalo; and even hunt them on their own. Moderately-sized hunting groups generally have higher success rates than lone females and larger groups.Packer, p. 150, 153, 164–165.
Lions are not particularly known for their stamina. For instance, a lioness's heart comprises only 0.57% of her body weight and a male's is about 0.45% of his body weight, whereas a hyena's heart comprises almost 1% of its body weight.Schaller, p. 248. Thus, lions run quickly only in short bursts at about and need to be close to their prey before starting the attack.Schaller, pp. 233, 247–248 They take advantage of factors that reduce visibility; many kills take place near some form of cover or at night.Schaller, p. 237. One study in 2018 recorded a lion running at a top speed of . The lion accelerates at the start of the chase by a rate of per second, whereas zebras, wildebeest and Thomson's gazelle accelerate by a rate of per second, per second, and per second respectively; acceleration appears to be more important than steady displacement speed in lion hunts. The lion's attack is short and powerful; it attempts to catch prey with a fast rush and final leap, usually pulls it down by the rump, and kills with a clamping bite to the Throat clamp or Muzzle clamp. It can hold the prey's throat for up to 13 minutes, until the prey stops moving.Schaller, p. 244, 263–267. It has a bite force from 1593.8 to 1768 Newtons at the canine tip and up to 4167.6 Newtons at the carnassial notch.
Lions typically consume prey at the location of the hunt but sometimes drag large prey into cover. They tend to squabble over kills, particularly the males. Cubs suffer most when food is scarce but otherwise all pride members eat their fill, including old and crippled lions, which can live on leftovers. Large kills are shared more widely among pride members.Schaller, p. 133. An adult lioness requires an average of about of meat per day while males require about .Schaller, p. 276. Lions gorge themselves and eat up to in one session. If it is unable to consume all of the kill, it rests for a few hours before continuing to eat. On hot days, the pride retreats to shade with one or two males standing guard.Schaller, pp. 270–76. Lions defend their kills from scavengers such as vultures and hyenas.
Lions scavenge on carrion when the opportunity arises, scavenging animals dead from natural causes such as disease or those that were killed by other predators. Scavenging lions keep a constant lookout for circling vultures, which indicate the death or distress of an animal.Schaller, p. 213–216. Most carrion on which both hyenas and lions feed upon are killed by hyenas rather than lions. Carrion is thought to provide a large part of lion diet.
Lions tend to dominate and leopards, steal their kills and kill their cubs and even adults when given the chance.
Lions similarly dominate African wild dogs, taking their kills and dispatching pups or adult dogs. Population densities of wild dogs are low in areas where lions are more abundant. However, there are a few reported cases of old and wounded lions falling prey to wild dogs.Schaller, p. 188.
Usually, the mother does not integrate herself and her cubs back into the pride until the cubs are six to eight weeks old. Sometimes the introduction to pride life occurs earlier, particularly if other lionesses have given birth at about the same time. When first introduced to the rest of the pride, lion cubs lack confidence when confronted with adults other than their mother. They soon begin to immerse themselves in the pride life, however, playing among themselves or attempting to initiate play with the adults. Lionesses with cubs of their own are more likely to be tolerant of another lioness's cubs than lionesses without cubs. Male tolerance of the cubs varies—one male could patiently let the cubs play with his tail or his mane, while another may snarl and bat the cubs away.Scott, p. 46.
Pride lionesses often synchronise their reproductive cycles and communal rearing and suckling of the young, which suckle indiscriminately from any or all of the nursing females in the pride. The synchronisation of births is advantageous because the cubs grow to being roughly the same size and have an equal chance of survival, and sucklings are not dominated by older cubs.Schaller, p. 147-49. Weaning occurs after six or seven months. Male lions reach maturity at about three years of age and at four to five years are capable of challenging and displacing adult males associated with another pride. They begin to age and weaken at between 10 and 15 years of age at the latest.
When one or more new males oust the previous males associated with a pride, the victors often kill any existing young cubs, perhaps because females do not become fertile and receptive until their cubs mature or die. Females often fiercely defend their cubs from a usurping male but are rarely successful unless a group of three or four mothers within a pride join forces against the male. Cubs also die from starvation and abandonment, and predation by leopards, hyenas and wild dogs. Male cubs are excluded from their maternal pride when they reach maturity at around two or three years of age,Schaller, p. 44. while some females may leave when they reach the age of two. When a new male lion takes over a pride, adolescents both male and female may be evicted.Scott, p. 68.
commonly infest the ears, neck and groin regions of the lions.Schaller, p. 184. Adult forms of several tapeworm species of the genus Taenia have been isolated from lion intestines, having been ingested as larvae in antelope meat. Lions in the Ngorongoro Crater were afflicted by an outbreak of stable fly ( Stable fly) in 1962, resulting in lions becoming emaciated and covered in bloody, bare patches. Lions sought unsuccessfully to evade the biting flies by climbing trees or crawling into hyena burrows; many died or migrated and the local population dropped from 70 to 15 individuals. A more recent outbreak in 2001 killed six lions.
Captive lions have been infected with canine distemper virus (CDV) since at least the mid-1970s. CDV is spread by domestic dogs and other carnivores; a 1994 outbreak in Serengeti National Park resulted in many lions developing neurological symptoms such as seizures. During the outbreak, several lions died from pneumonia and encephalitis. Feline immunodeficiency virus and lentivirus also affect captive lions.
Lions have an array of facial expressions and body postures that serve as visual gestures.Schaller, pp. 103–117. A common facial expression is the "grimace face" or flehmen response, which a lion makes when sniffing chemical signals and involves an open mouth with bared teeth, raised muzzle, wrinkled nose, closed eyes and relaxed ears.Schaller, p. 95. Lions also use chemical and visual marking; males spray urineSchaller, p. 116. and scrape plots of ground and objects within the territory.
The lion's repertoire of vocalisations is large; variations in intensity and pitch appear to be central to communication. Most lion vocalisations are variations of roaring, growling and snarling. Other sounds produced include puffing, humming, and exhalations similar to purring, while cubs communicate by and bleating. Roaring is used to advertise the animal's presence. Lions most often roar at night, a sound that can be heard from a distance of .Schaller, pp. 103–113. They tend to roar in a very characteristic manner starting with a few deep, long roars that subside into grunts.
In the Republic of the Congo, Odzala-Kokoua National Park was considered a lion stronghold in the 1990s. By 2014, no lions were recorded in the protected area so the population is considered locally extinct. The West African lion population is isolated from the one in Central Africa, with little or no exchange of breeding individuals. In 2015, it was estimated that this population consists of about 400 animals, including fewer than 250 mature individuals. They persist in three protected areas in the region, mostly in one population in the W A P protected area complex, shared by Benin, Burkina Faso and Niger. This population is listed as Critically Endangered. Field surveys in the WAP ecosystem revealed that lion occupancy is lowest in the W National Park, and higher in areas with permanent staff and thus better protection.
A population occurs in Cameroon's Waza National Park, where between approximately 14 and 21 animals persisted as of 2009. In addition, 50 to 150 lions are estimated to be present in Burkina Faso's Arly-Singou ecosystem. In 2015, an adult male lion and a female lion were sighted in Ghana's Mole National Park. These were the first sightings of lions in the country in 39 years. In the same year, a population of up to 200 lions that was previously thought to have been Local extinction was filmed in the Alatash National Park, Ethiopia, close to the Sudanese border.
In 2005, Lion Conservation Strategies were developed for West and Central Africa, and East and Southern Africa. The strategies seek to maintain suitable habitat, ensure a sufficient wild prey base for lions, reduce factors that lead to further fragmentation of populations, and make lion–human coexistence sustainable. Lion depredation on livestock is significantly reduced in areas where herders keep livestock in improved enclosures. Such measures contribute to mitigating human–lion conflict.
The presence of numerous human settlements close to Gir National Park resulted in conflict between lions, local people and their livestock. Some consider the presence of lions a benefit, as they keep populations of crop damaging herbivores in check.
In 1982, the Association of Zoos and Aquariums started a Species Survival Plan for the Asiatic lion to increase its chances of survival. In 1987, it was found that most lions in North American zoos were hybrids between African and Asiatic lions. Breeding programs need to note origins of the participating animals to avoid cross-breeding different subspecies and thus reducing their conservation value.
About 77% of the captive lions registered in the International Species Information System in 2006 were of unknown origin; these animals might have carried genes that are extinct in the wild and may therefore be important to the maintenance of the overall genetic variability of the lion.
The first European "zoos" spread among noble and royal families in the 13th century, and until the 17th century were called . At that time, they came to be called , an extension of the cabinet of curiosities. They spread from France and Italy during the Renaissance to the rest of Europe.Baratay & Hardouin-Fugier, pp. 19–21, 42. In England, although the seraglio tradition was less developed, lions were kept at the Tower of London in a seraglio established by King John in the 13th century;Baratay & Hardouin-Fugier, p. 20. this was probably stocked with animals from an earlier menagerie started in 1125 by Henry I at his hunting lodge in Woodstock, Oxfordshire, where according to William of Malmesbury lions had been stocked.Blunt, p. 15.
Lions were kept in cramped and squalid conditions at London Zoo until a larger lion house with roomier cages was built in the 1870s.Blunt, p. 208. Further changes took place in the early 20th century when Carl Hagenbeck designed enclosures with concrete "rocks", more open space and a moat instead of bars, more closely resembling a natural habitat. Hagenbeck designed lion enclosures for both Melbourne Zoo and Sydney's Taronga Zoo; although his designs were popular, the use of bars and caged enclosures prevailed in many zoos until the 1960s.de Courcy, p. 69. In the late 20th century, larger, more natural enclosures and the use of wire mesh or laminated glass instead of lowered dens allowed visitors to come closer than ever to the animals; some attractions such as the Cat Forest/Lion Overlook of Oklahoma City Zoological Park placed the den on ground level, higher than visitors.
Lion taming has been part of both established and individual acts such as Siegfried & Roy. The practice began in the early 19th century by Frenchman Henri Martin and American Isaac Van Amburgh, who both toured widely and whose techniques were copied by a number of followers. Martin composed a pantomime titled Les Lions de Mysore ("the lions of Mysore"), an idea Amburgh quickly borrowed. These acts eclipsed equestrianism acts as the central display of circus shows and entered public consciousness in the early 20th century with cinema. In demonstrating the superiority of human over animal, lion taming served a purpose similar to animal fights of previous centuries.Baratay & Hardouin-Fugier, p. 187. The ultimate proof of a tamer's dominance and control over a lion is demonstrated by the placing of the tamer's head in the lion's mouth. The now-iconic lion tamer's chair was possibly first used by American Clyde Beatty (1903–1965).
The Maasai people have traditionally viewed the killing of lions as a rite of passage. Historically, lions were hunted by individuals, however, due to reduced lion populations, elders discourage solo lion hunts. During the European colonisation of Africa in the 19th century, the hunting of lions was encouraged because they were considered pests and lion skins were sold for Pound sterling each.Jackson, p. 166. The widely reproduced imagery of the heroic hunter chasing lions would dominate a large part of the century.Baratay & Hardouin-Fugier, p. 113. Trophy hunting of lions in recent years has been met with controversy, notably with the killing of Cecil the lion in mid-2015.
Lions' proclivity for man-eating has been systematically examined. American and Tanzanian scientists report that man-eating behaviour in rural areas of Tanzania increased greatly from 1990 to 2005. At least 563 villagers were attacked and many eaten over this period. The incidents occurred near Selous Game Reserve in Rufiji River and in Lindi Region near the Mozambican border. While the expansion of villages into bush country is one concern, the authors argue conservation policy must mitigate the danger because in this case, conservation contributes directly to human deaths. Cases in Lindi in which lions seize humans from the centres of substantial villages have been documented. Another study of 1,000 people attacked by lions in southern Tanzania between 1988 and 2009 found that the weeks following the full moon, when there was less moonlight, were a strong indicator of increased night-time attacks on people.
According to Robert R. Frump, Mozambican refugees regularly crossing Kruger National Park, South Africa, at night are attacked and eaten by lions. Frump said thousands may have been killed in the decades after apartheid sealed the park and forced refugees to cross the park at night.
In sub-Saharan Africa, the lion has been a common character in stories, proverbs and dances, but rarely featured in visual arts.Jackson, p. 119. In the Swahili language, the lion is known as simba which also means "aggressive", "king" and "strong". In parts of West and East Africa, the lion is associated with healing and provides the connection between Clairvoyance and the supernatural. In other East African traditions, the lion represents laziness. In much of African folklore, the lion is portrayed as having low intelligence and is easily tricked. In Nubia, the lion-god Apedemak was associated with the flooding of the Nile. In Ancient Egypt, lions were linked both with the sun and the waters of the Nile. Several gods were conceived as being part lion, including the war deities Sekhmet and Maahes, and Tefnut, the goddess of moisture..Jackson, pp. 107–108, 111.
The lion was a prominent symbol in ancient Mesopotamia from Sumer up to and times, where it was strongly associated with kingship. The big cat was a symbol and steed of fertility goddess Inanna. Lions decorate the Processional Way leading to the Ishtar Gate in Babylon which was built by Nebuchadnezzar II in the 6th century BCE. The Lion of Babylon symbolised the power of the king and protection of the land against enemies, but was also invoked for good luck. The constellation Leo the lion was first recognised by the Sumerians around 4,000 years ago and is the fifth sign of the zodiac. In ancient Israel, a lion represented the tribe of Judah.Jackson, pp. 109, 115. Lions are frequently mentioned in the Bible, notably in the Book of Daniel, in which the eponymous hero is forced to sleep in the lions' den.
Indo-Persian chroniclers regarded the lion as keeper of order in the realm of animals. The Sanskrit word mrigendra signifies a lion as king of animals. In India, the Lion Capital of Ashoka, erected by Emperor Ashoka in the 3rd century BCE, depicts four lions standing back to back. In Hindu mythology, the half-lion Narasimha, an avatar of the deity Vishnu, battles and slays the evil ruler Hiranyakashipu. In Buddhist art, lions are associated with both and and may be ridden by the Manjushri. Though they were never native to the country, lions have played important roles in Chinese culture. Statues of the beast have guarded the entrances to the imperial palace and many religious shrines. The lion dance has been performed for over a thousand years.Jackson, pp. 113, 119–122, 124.
In ancient Greece, the lion is featured in several of Aesop's fables, notably The Lion and the Mouse. In Greek mythology, the Nemean lion is slain by the hero Heracles who wears its skin. Lancelot and Gawain were also heroes slaying lions in Middle Ages. Lions continue to appear in modern literature such as the Cowardly Lion in L. Frank Baum's 1900 The Wonderful Wizard of Oz, and in C. S. Lewis's The Lion, the Witch and the Wardrobe. For cinema, the lion was portrayed as the ruler of animals in the 1994 Disney animated feature film The Lion King.Jackson, pp. 7, 96, 99, 103–105, 128, 135, 150, 197.
Hybrids
Description
Size
Head-and-body length Tail length Weight in Southern Africa, in East Africa, in India in Southern Africa, in East Africa, in India
Mane
Colour variation
Distribution and habitat
Historical range
Behaviour and ecology
Group organisation
Hunting and diet
Predatory competition
Reproduction and life cycle
Health and mortality
Communication
Conservation
In Africa
In Asia
Captive breeding
Interactions with humans
In zoos and circuses
Hunting and games
Man-eating
Cultural significance
See also
Notes
Citations
Books
External links
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