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Elephant: the story on HearLore | HearLore
Elephant
The trunk of an elephant is a muscular hydrostat containing up to 150,000 separate muscle fascicles, a complex organ with no bone and little fat that allows the animal to perform tasks ranging from cracking a peanut shell without breaking the seed to lifting objects weighing up to 300 kilograms. This versatile appendage, which consists of both the nose and upper lip fused during early fetal development, serves as the primary tool for foraging, drinking, and social interaction. The trunk's flexibility is aided by numerous wrinkles in the skin and allows the elephant to reach items up to 2.5 meters high or dig for water in the mud and sand below. It also functions as a powerful sense organ, with a sense of smell estimated to be four times greater than that of a bloodhound's nose. Whiskers grow along the trunk, particularly packed at the tip, contributing to its tactile sensitivity, while the trunk can expand its nostrils by 30 percent to increase nasal volume and breathe in almost 30 times faster than a human sneeze. When underwater, the trunk acts as a snorkel, allowing the elephant to breathe while submerged. The trunk is so vital to survival that damaging it can be fatal, though rare cases of trunkless elephants have been observed grazing using their lips while balancing on their front knees.
Matriarchs and Musth
Elephant society is built around a complex, stratified social structure where female elephants spend their entire lives in tight-knit matrilineal family groups led by a matriarch, who is often the eldest female. This leader remains in charge until death or until she no longer has the energy for the role, and when her tenure ends, her eldest daughter takes her place rather than her sister. The death of a matriarch has been found to lead to greater stress in the surviving elephants, highlighting the critical importance of her knowledge and leadership. Adult males, however, live separate lives, leaving their family groups when they reach puberty to live alone or with other males. These bulls enter a state of increased testosterone known as musth, which can last from days to months and is characterized by fluid discharged from the temporal gland running down the side of their face. During musth, males become extremely aggressive, winning the majority of agonistic encounters even against larger non-musth bulls, and they use this state to gain dominance and reproductive success. While females are sexually mature by the age of nine years, males do not enter musth until they are at least 15 years old, and it is not very intense until they are older than 25.
Giants of the Past
The earliest members of the order Proboscidea, such as Eritherium, appeared in the Paleocene of Africa around 60 million years ago and were much smaller than living elephants, with a body mass of around 40 kilograms. Over millions of years, proboscideans grew in size, developing longer limbs, wider feet, and a more digitigrade stance, while the trunk evolved to provide reach and the incisors developed into tusks of different shapes and sizes. A major event in this evolution was the collision of Afro-Arabia with Eurasia during the Early Miocene, around 18 to 19 million years ago, which allowed proboscideans to disperse from their African homeland across Eurasia and later into North America. The Late Pleistocene saw a dramatic decline in proboscidean diversity, with all remaining non-elephantid proboscideans and the genus Palaeoloxodon becoming extinct, leaving only the modern genera Elephas and Loxodonta. One extinct species, Palaeoloxodon namadicus, is a contender for the largest land mammal to have ever existed, exceeding 4 meters in height and 10 tonnes in body mass. In contrast, some species experienced insular dwarfism, such as the 1 meter tall dwarf elephant species Palaeoloxodon falconeri found on islands.
Common questions
How many muscles are in an elephant trunk?
The trunk of an elephant contains up to 150,000 separate muscle fascicles. This complex organ has no bone and little fat, allowing the animal to perform tasks ranging from cracking a peanut shell to lifting objects weighing up to 300 kilograms.
When did the earliest members of the order Proboscidea appear?
The earliest members of the order Proboscidea, such as Eritherium, appeared in the Paleocene of Africa around 60 million years ago. These early proboscideans were much smaller than living elephants, with a body mass of around 40 kilograms.
What year was ivory banned internationally?
Ivory was banned internationally in 1990 following the listing of the African elephant under Appendix I by the Convention on International Trade in Endangered Species of Wild Fauna and Flora in 1989. Despite these bans, poaching continues to be a major threat, with 650 elephants in Bouba Njida National Park, Cameroon, slaughtered by Chadian raiders in February 2012.
How far can elephant infrasonic rumbles travel?
Elephant infrasonic rumbles can travel over 10 kilometers. These calls have a frequency of 14 to 24 Hz for Asian elephants and 15 to 35 Hz for African elephants, allowing for long-distance communication that is often inaudible to humans.
When did Hannibal take elephants across the Alps?
The Carthaginian general Hannibal took African elephants across the Alps during his war with the Romans in 218 BC. This event dates back to at least 1500 BC when elephants were used as working animals, with the practice of using elephants in warfare extending back to that era.
The tusks of an elephant are modified second incisors that replace deciduous milk teeth at 6 to 12 months of age and keep growing at about 1.5 centimeters a year. These living tissues contain nerves that stretch deep into the tusk, making removal difficult without harming the animal, and the dentine, known as ivory, has a cross-section of intersecting lines called engine turning. Historically, the ivory trade has been one of the most significant threats to elephant populations, with the trade contributing to the fall of the African elephant population in the late 20th century. In 1989, the African elephant was listed under Appendix I by the Convention on International Trade in Endangered Species of Wild Fauna and Flora, making trade illegal, and by 1990, ivory was banned internationally. Despite these bans, poaching continues to be a major threat, with 650 elephants in Bouba Njida National Park, Cameroon, slaughtered by Chadian raiders in February 2012, an event called one of the worst concentrated killings since the ivory ban. The demand for ivory has also led to an effective selection pressure for shorter tusks and tusklessness, particularly among Sri Lankan elephants, where tuskless males are particularly common.
Echoes in the Earth
Elephants communicate through a variety of methods including touch, sight, smell, and sound, with a unique ability to produce infrasonic rumbles that can travel over 10 kilometers. These calls, which have a frequency of 14 to 24 Hz for Asian elephants and 15 to 35 Hz for African elephants, allow for long-distance communication that is often inaudible to humans. In addition to vocalizations, elephants use seismic communication, creating vibrations by stomping their feet or mock charging that can be heard at travel distances of up to 10 kilometers. The brain of an elephant weighs around 5 kilograms, making it the largest of all terrestrial mammals, and while it is proportionally smaller than the human brain, the temporal lobes are so large that they bulge out laterally. Elephants exhibit mirror self-recognition, an indication of self-awareness and cognition that has also been demonstrated in some apes and dolphins, and they appear to have cognitive maps that give them long-lasting memories of their environment on a wide scale. Scientists debate the extent to which elephants feel emotion, but they are attracted to the bones of their own kind, regardless of whether they are related, and a dying or dead elephant may elicit attention and aid from others.
The Human Elephant Conflict
Elephants have been used as working animals since at least the Indus Valley civilization over 4,000 years ago, and there were 13,000 to 16,500 working elephants employed in Asia in 2000. These animals are typically captured from the wild when they are 10 to 20 years old, the age range when they are both more trainable and can work for more years, and they are valued over mechanized tools for their ability to perform tasks in difficult terrain. However, the practice of working elephants has also been associated with abuse, and in both Myanmar and Thailand, deforestation and other economic factors have resulted in sizable populations of unemployed elephants. The use of elephants in warfare dates back to at least 1500 BC, with the Carthaginian general Hannibal famously taking African elephants across the Alps during his war with the Romans in 218 BC. Today, elephants are often controversially put on display in zoos or employed for entertainment in circuses, with the most famous circus elephant being Jumbo, who lived from 1861 to 1885 and was a major attraction in the Barnum & Bailey Circus. The use of elephants in circuses has been accused of mistreating and distressing their animals, with the Humane Society of the United States citing the use of metal-tipped prods called bull hooks or ankus to control them.
Guardians of the Ecosystem
Elephants are considered keystone species due to their massive impact on their environments, with their habit of uprooting trees and undergrowth transforming savannahs into grasslands that smaller herbivores can access. When they dig for water during droughts, they create waterholes that can be used by other animals, and at Mount Elgon, elephants dig through caves and pave the way for ungulates, hyraxes, bats, birds, and insects. Elephants are important seed dispersers, with African forest elephants consuming and depositing many seeds over great distances, and because most of the food elephants eat goes undigested, their dung can provide food for other animals such as dung beetles and monkeys. However, elephants can also have a negative impact on ecosystems, with their weight causing soil to compress and leading to runoff and erosion, and at Murchison Falls National Park in Uganda, elephant numbers have threatened several species of small birds that depend on woodlands. The size of adult elephants makes them nearly invulnerable to predators, though calves may be preyed on by lions, spotted hyenas, and wild dogs in Africa and tigers in Asia, and the lions of Savuti, Botswana, have adapted to hunting elephants, targeting calves, juveniles, or even sub-adults.