Subspecies
Traditionally, twelve recent subspecies of lion were recognized, the largest of which has been recognized as the Barbary Lion. The major differences separating these subspecies are location, mane appearance, size, and distribution. Because these characteristics are very insignificant and show a high individual variability, most of these forms were debatable and probably invalid; additionally, they often were based upon zoo material of unknown origin that may have had "striking, but abnormal" morphological characteristics. Today only eight subspecies usually are accepted, but one of these (the Cape Lion formerly described as Panthera leo melanochaita) probably is invalid. Even the remaining seven subspecies might be too many; mitochondrial variation in recent African lions is modest, which suggests that all sub-Saharan lions could be considered a single subspecies, possibly divided in two main clades: one to the west of the Great Rift Valley and the other to the east. Lions from Tsavo in Eastern Kenya are much closer genetically to lions in Transvaal (South Africa), than to those in the Aberdare Range in Western Kenya.
Recent
Eight recent subspecies are recognized today:
* P. l. persica, known as the Asiatic Lion or South Asian, Persian, or Indian Lion, once was widespread from Turkey, across the Middle East, to Pakistan, India, and even to Bangladesh. However, large prides and daylight activity made them easier to poach than tigers or leopards; now around 300 exist in and near the Gir Forest of India.
* P. l. leo, known as the Barbary Lion, is extinct in the wild due to excessive hunting, although captive individuals may still exist. This was one of the largest of the lion subspecies, with reported lengths of 3–3.3 metres (10–10.8 ft) and weights of more than 200 kilograms (440 lb) for males. They ranged from Morocco to Egypt. The last wild Barbary lion was killed in Morocco in 1922.
* P. l. senegalensis, known as the West African Lion, is found in western Africa, from Senegal to Nigeria.
* P. l. azandica, known as the Northeast Congo Lion, is found in the northeastern parts of the Congo.
* P. l. nubica, known as the East African or Massai Lion, is found in east Africa, from Ethiopia and Kenya to Tanzania and Mozambique.
* P. l. bleyenberghi, known as the Southwest African or Katanga Lion, is found in southwestern Africa, Namibia, Botswana, Angola, Katanga (Zaire), Zambia, and Zimbabwe.
* P. l. krugeri, known as the Southeast African Lion or Transvaal Lion, is found in the Transvaal region of southeastern Africa, including Kruger National Park.
* P. l. melanochaita, known as the Cape Lion, became extinct in the wild around 1860. Results of mitochondrial DNA research do not support the status as a distinct subspecies. It seems probable that the Cape lion was only the southernmost population of the extant P. l. krugeri.
Prehistoric
Several additional subspecies of lion existed in prehistoric times:
* P. l. atrox, known as the American Lion or American cave lion, was abundant in the Americas from Alaska to Peru in the Pleistocene Epoch until about 10,000 years ago. This form as well as the cave lion sometimes are considered to represent separate species, but recent phylogenetic studies suggest that they are in fact, subspecies of the lion (Panthera leo). One of the largest lion subspecies to have existed, its body length is estimated to have been 1.6–2.5 m (5–8 ft).
* P. l. fossilis, known as the Early Middle Pleistocene European cave lion, flourished about 500,000 years ago; fossils have been recovered from Germany and Italy. It was larger than today's African lions, reaching the American cave lion in size.
* P. l. spelaea, known as the European cave lion, Eurasian cave lion, or Upper Pleistocene European cave lion, occurred in Eurasia 300,000 to 10,000 years ago. This species is known from Paleolithic cave paintings (such as the one displayed to the right), ivory carvings, and clay busts, indicating it had protruding ears, tufted tails, perhaps faint tiger-like stripes, and that at least some males had a ruff or primitive mane around their necks. With this example being a hunting scene it is likely that it depicts females hunting for the pride using the same strategy as their contemporary relatives and males may not be part of the subject.
* P. l. vereshchagini, known as the East Siberian- or Beringian cave lion, was found in Yakutia (Russia), Alaska (USA), and the Yukon Territory (Canada). Analysis of skulls and mandibles of this lion demonstrate that it is distinctly—larger than the European cave lion and smaller than the American cave lion with differing skull proportions.
Dubious
* P. l. sinhaleyus, known as the Sri Lanka Lion, appears to have become extinct approximately 39,000 years ago. It is only known from two teeth found in deposits at Kuruwita. Based on these teeth, P. Deraniyagala erected this subspecies in 1939.
* P. l. europaea, known as the European Lion, probably was identical with Panthera leo persica or Panthera leo spelea; its status as a subspecies is unconfirmed. It became extinct around 100 AD due to persecution and over-exploitation. It inhabited the Balkans, the Italian Peninsula, southern France, and the Iberian Peninsula. It was a very popular object of hunting among Romans, Greeks, and Macedonians.
* P. l. youngi or Panthera youngi, flourished 350,000 years ago.[31] Its relationship to the extant lion subspecies is obscure, and it probably represents a distinct species.
* P. l. maculatus, known as the Marozi or Spotted lion, sometimes is believed to be a distinct subspecies, but may be an adult lion that has retained its juvenile spotted pattern. If it was a subspecies in its own right, rather than a small number of aberrantly colored individuals, it has been extinct since 1931. A less likely identity is a natural leopard-lion hybrid commonly known as a leopon.
Hybrids
Lions have been known to breed with tigers (most often the Siberian and Bengal subspecies) to create hybrids called ligers and tigons. They also have been crossed with leopards to produce leopons, and jaguars to produce jaglions. The marozi is reputedly a spotted lion or a naturally occurring leopon, while the Congolese Spotted Lion is a complex lion-jaguar-leopard hybrid called a lijagulep. Such hybrids once commonly were bred in zoos, but this is now discouraged due to the emphasis on conserving species and subspecies. Hybrids are still bred in private menageries and in zoos in China.
The liger is a cross between a male lion and a tigress. Because the growth-inhibiting gene from the female tiger is absent, a growth-promoting gene is passed on by the male lion, the resulting ligers grow far larger than either parent. They share physical and behavioural qualities of both parent species (spots and stripes on a sandy background). Male ligers are sterile, but female ligers are often fertile. Males have about a 50 percent chance of having a mane, but if they grow one, their manes will be modest: around 50 percent of a pure lion mane. Ligers are typically between 3.0 and 3.7 m (10 to 12 feet) in length, and can be between 360 and 450 kg (800 to 1,000 pounds) or more. The less common tigon is a cross between the lioness and the male tiger.