Elephant

• 1. Introduction

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  Elephants are the largest living land animals on Earth, and yet a single one of them can crack open a peanut shell with its trunk without breaking the seed inside. That combination of enormous scale and extraordinary precision sits at the heart of what makes these animals so remarkable. Three species survive today: the African bush elephant, the African forest elephant, and the Asian elephant. They are the sole remaining members of a lineage that once included mammoths and mastodons. What drives the matriarch who leads a family group across hundreds of kilometres of shifting savannah? How did an animal this large evolve a trunk containing up to 150,000 separate muscle units? And why, despite everything we know about their intelligence and social bonds, are two of these three species listed as endangered and one as critically endangered? Those are the questions this documentary will answer.

• 2. A Body Built for Scale

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  An elephant's skeleton contains between 326 and 351 bones, more than the 206 found in a human. The skull is filled with air cavities that reduce its weight while preserving structural strength, giving its interior a honeycomb-like appearance. The brain it houses weighs between 4.5 and 5.5 kg, the largest of any terrestrial mammal, though it is proportionally smaller than the human brain relative to body size.

  The heart weighs between 12 and 21 kg and has an unusual double-pointed apex. When an elephant lies down, its heart rate actually increases from around 28 beats per minute to about 35, the opposite of what happens in most animals. The lungs attach directly to the diaphragm rather than floating free within a pleural cavity, an arrangement that may help the animal manage pressure differences when it wades through deep water with its trunk raised above the surface.

  The skin on an elephant's back and head can reach 2.5 cm thick, yet it remains sensitive enough to require mud baths for protection from insect bites and sunburn. Because an elephant's surface-area-to-volume ratio is far smaller than a human's, shedding body heat through the skin alone is difficult. Cracks in the skin may actually assist long-term thermoregulation by allowing water to evaporate more easily. Elephants also have sweat glands only between the toes, which makes their ears and their behaviour central to staying cool.

  The ear flaps, called pinnae, are 1-2 mm thick at the centre and laced with blood vessel networks called capillaries. Warm blood travels into these capillaries and releases heat to the air; flapping the ears speeds that process. African bush elephants, which live in the hottest climates of the three species, have the largest ear flaps of all.

• 3. The Trunk

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  No structure in the animal kingdom quite resembles the elephant's trunk. It is formed from the fused nose and upper lip, a fusion that occurs in early fetal development, and it contains up to 150,000 separate muscle units with no bone and almost no fat. Five distinct muscle groups, divided into superficial and internal types, give it near-unlimited flexibility through three basic motions: bending, twisting, and longitudinal stretching.

  The trunk can lift up to 350 kg and yet move with enough finesse to reach items 7 m above the ground or dig for water underground. It can expand the nostrils by 30%, increasing nasal volume by 64%, and draw air inward at over 150 metres per second, nearly 30 times faster than a human sneeze. An adult Asian elephant's trunk can hold 8.5 litres of water at once.

  The sense of smell carried by the trunk may be four times more acute than a bloodhound's. The infraorbital nerve running through it, which governs touch sensitivity, is thicker than either the optic or auditory nerves. Whiskers grow along its length, particularly dense at the tip, and assist with tactile sensing. Unlike cats or rats, elephants cannot move these whiskers independently; the trunk itself must move to bring them into contact with an object.

  African elephants have two finger-like extensions at the trunk's tip for picking up small items; Asian elephants have one and tend to wrap the trunk around objects instead. Individuals even show a lateral preference, some consistently twisting left, others right, much as humans favour a dominant hand. When submerged, the trunk becomes a snorkel. One trunkless elephant has been observed grazing by pressing its lips to the ground with its hind legs lifted and its weight balanced on its front knees.

• 4. Tusks, Teeth, and Ivory

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  Tusks are modified second incisors of the upper jaw. They replace milk teeth at 6-12 months of age and grow at roughly 17 cm per year throughout the animal's life. At least one-third of each tusk lies hidden inside the skull, containing pulp and, in some individuals, nerves that extend even deeper. Removing a tusk without harming the elephant would be nearly impossible.

  The dentine inside a tusk is ivory. In cross-section it shows a pattern of intersecting lines that produce diamond-shaped figures, a characteristic known as "engine turning" that distinguishes genuine elephant ivory from imitations. Once removed from the animal, ivory will dry and crack unless kept cool and wet.

  Elephants are typically right- or left-tusked, and the dominant tusk tends to be shorter and more worn. For African elephants, both sexes carry tusks of roughly comparable length, reaching up to 300 cm, though male tusks are more massive. Among Asian elephants, only males grow large tusks; females have very small ones or none at all. Tuskless males exist and are particularly common among Sri Lankan elephants. Hunting pressure has acted as a selection force pushing toward shorter tusks and tusklessness across both continents.

  Teeth tell a different story than tusks. Elephants have 26 teeth in total, and unlike most mammals they do not replace teeth vertically. Instead, new molars grow at the back of the jaw and push forward, displacing the worn-out tooth in front. This process happens about five times, with tooth replacements occurring at roughly ages two to three, four to six, 9-15, 18-28, and finally in the early 40s. The sixth and final set must last the animal the rest of its life.

• 5. Society and the Matriarch

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  Female elephants spend their entire lives in tight maternal family groups, almost always led by the oldest cow, known as the matriarch. She retains her role until death or until she no longer has the stamina for it; research on zoo elephants found that her death increased stress levels measurably in the surviving members of her group. When she steps down, her eldest daughter takes over rather than a sister.

  At Amboseli National Park in Kenya, African bush elephant families average about ten members. Several families may join into bond groups, and during dry seasons multiple bond groups aggregate into larger clans, numbering around nine, to share resources. At the same time, the population divides into central and peripheral subpopulations. Younger matriarchs have been found to assess potential threats less carefully than older ones, suggesting that the accumulated experience of older females is directly protective for the group.

  Male elephants leave their family groups at puberty and either live alone or join loose, fluid groups of other males. At Amboseli, young males spend up to 80% of their time away from their families by the age of 14-15 years. Among all-male groupings, older bulls play a stabilising role: their presence suppresses aggressive and erratic behaviour in younger males. The largest all-male groups can contain close to 150 individuals.

  Musth, a state of elevated testosterone, transforms adult bulls. The onset typically begins around age 15, but does not become intense until past 25. At Amboseli, no bull under 24 was found to be in musth, while all bulls over 35 were. The characteristic sign is a fluid discharge from the temporal gland that runs down the face. During musth, a bull will pursue and guard oestrous females, and he will usually defeat even larger non-musth bulls in direct competition. Females actively seek out older musth bulls to mate with, apparently reading their condition as an indicator of fitness.

• 6. Intelligence and Inner Life

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  Mirror self-recognition has been demonstrated in elephants, placing them in the small group of animals, including some apes and dolphins, that recognise themselves as distinct individuals. In one study, a captive female Asian elephant accurately distinguished between multiple visual and acoustic discrimination pairs and retained that accuracy when re-tested a full year later.

  Elephants have been observed modifying branches for use as flyswatters, a form of tool use, though the researchers noted it is not as sophisticated as the tool modification seen in chimpanzees. Cognitive mapping may explain their legendary memory; individuals appear to retain long-term spatial knowledge of wide areas and may track the locations of their family members over time.

  The question of emotional experience is genuinely contested. Elephants are drawn to the bones of other elephants regardless of whether they are related. When a group member is dying or dead, others including individuals from different groups may gather, touch, and attend to the body in ways that have been interpreted as expressing concern. The Oxford Companion to Animal Behaviour, published in 1987, offered a careful counterpoint: that observers are better served by studying the behaviour itself rather than attempting to identify the emotion underneath it.

  Calves are born at roughly 85 cm tall and around 120 kg and are immediately the focus of the entire herd, which gathers to touch and caress the newborn. By nine months, a calf has mastered the coordination of mouth, trunk, and foot together. Play in young elephants divides along sex lines: females run and chase, while males play-fight. The species as a whole can reach 60-70 years in the wild, and Lin Wang, a captive male Asian elephant, lived to 86 years.

• 7. Threats and Conservation

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  In 1979, Africa was estimated to hold at least 1.3 million elephants, possibly as many as 3 million. By the end of the following decade that figure had fallen to around 609,000. Between 1977 and 1989, populations in East Africa declined by 74%. After 1987, savannah populations from Cameroon to Somalia dropped by 80%. The ivory trade drove much of this collapse.

  The United States was the first country to ban ivory imports, acting in June 1989. International trade in ivory was banned by CITES in 1990. In February 2012, 650 elephants were slaughtered in Bouba Njida National Park in Cameroon by raiders from Chad, an event described as one of the worst concentrated killings since the ivory ban took effect. China, historically the largest market for poached ivory, announced in May 2015 that it would phase out legal domestic ivory manufacturing and sales. In September 2015, China and the United States together pledged a near-complete ban on ivory import and export.

  As of 2021, both the African bush elephant and the African forest elephant were listed by the IUCN, the African bush elephant as Endangered and the African forest elephant as Critically Endangered. The total combined African elephant population was estimated at around 415,000 individuals as of 2016. The Asian elephant, listed as Endangered by the IUCN in 2020 due to a population decline of roughly half over three generations, is estimated to number between 40,000 and 50,000 individuals, with around 60% of those in India.

  Hunting has produced a measurable genetic shift: selection pressure from poaching is pushing wild populations toward shorter tusks and tusklessness. Habitat loss and human-elephant conflict claim lives on both sides; between 2019 and 2022, elephants killed around 1,500 people in India, which in turn led to around 300 elephants being killed in retaliation. Chili pepper products and physical guarding have been found to reduce crop-raiding more effectively than beehive or electric fences.

• 8. In Human Culture

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  Elephants have appeared in human art since the Paleolithic, with rock carvings found across the Sahara and southern Africa. Medieval European artists who had never seen a living elephant depicted them as blended fantasy creatures with horse, bovine, and boar features and trumpet-like trunks. As captive elephants became accessible to European artists during the 15th century, accuracy improved, including a rendering by Leonardo da Vinci.

  In Hinduism, Ganesha, the elephant-headed deity, is considered equal in some traditions to the supreme gods Shiva, Vishnu, and Brahma. He is associated with writers and merchants and is believed able both to grant success and to withdraw it. In Buddhism, the Buddha is said to have taken the form of a white elephant when entering his mother's womb for his final human rebirth. The Mbuti people of central Africa believe that dead ancestors reside in elephants; other African societies held that their chiefs would be reincarnated as the animals. At Igbo-Ukwu in present-day Nigeria, during the 10th century AD, elephant tusks were placed under a dead leader's feet in his grave.

  The circus elephant Jumbo, who lived from 1861 until the 15th of September 1885, was one of the most famous animals in Barnum and Bailey Circus history. In 2009, Barnum and Bailey CEO Kenneth Feld acknowledged in testimony to a US federal court that elephants in the circus were struck with metal-tipped prods behind the ears, under the chins, and on the legs. The circus retired its touring elephants in May 2016. Trainer Ralph Helfer took the opposite approach, relying entirely on positive reinforcement.

  In language, an elephant in the room names something obvious that everyone is avoiding. A white elephant is something unwanted and without practical value. The phrase "elephant memory" invokes the cognitive maps researchers believe these animals carry, maps that may hold the positions of family members across ranges stretching hundreds of kilometres.