mammoth
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What is a mammoth?
A mammoth is any member of an extinct group of elephants. They are found as fossils in Pleistocene deposits on every continent except Australia and South America and in early Holocene deposits of North America.
The best-known species is the woolly mammoth (Mammuthus primigenius). These animals died out around 10,000 years ago, after the last Ice Age. Climate change and hunting by humans contributed to their extinction. They stood 10 to 12 feet tall and weighed 6 to 8 tons. They had a yellowish-brown undercoat and a coarser outer covering of dark brown hair.
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How are mammoths different from modern elephants?
Mammoths, particularly the woolly mammoth (Mammuthus primigenius), differ from modern elephants in several ways. Most mammoths were about the same size as modern elephants, with the North American imperial mammoth (M. imperator) reaching 4 meters (14 feet) at the shoulder. The woolly mammoth had a thick coat of fur, small ears to minimize heat loss, and a hump of fat on its back for energy and water storage, all adaptations to the cold climates of the Pleistocene ice ages. Their tusks were also directed downwards and were very long.
Mammoths are closely related to present-day Asian elephants, diverging approximately six million years ago. The oldest mammoth DNA, dating back over a million years, may belong to a direct ancestor of the woolly mammoth. Woolly mammoths were largely extinct by about 10,000 years ago, due to climate change and hunting by humans.
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Where and when did mammoths live?
Mammoths lived across the globe, with fossils discovered in Pleistocene deposits on every continent except Australia and South America. The woolly mammoth (Mammuthus primigenius) specifically inhabited Europe, northern Asia, and North America.
Woolly mammoths thrived during the Pleistocene ice ages but died out after the Earth's climate warmed. Most mammoths went extinct around 10,000 years ago, though small populations survived in North America until 7,600 years ago. Some lived on Wrangel Island, off the coast of northern Russia, as late as 4,300 years ago.
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What did mammoths eat and how did they survive in cold climates?
Woolly mammoths primarily consumed tundra plants and shrubs in their steppe tundra habitat.
To survive the cold climates, woolly mammoths had several adaptations:
* A thick, yellowish-brown undercoat measuring about 2.5 cm, covered by a coarser layer of dark brown hair exceeding 70 cm in length.
* Beneath their thick skin, they possessed an insulating fat layer of up to 8 cm.
* Their relatively small ears minimized heat loss.
* A hump of fat on their backs served as an energy and water reserve.5 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
Why did mammoths become extinct?
Woolly mammoths, thriving during the Pleistocene ice ages, eventually died out due to a combination of factors. The warming climate after the last ice age reduced their habitat, and extensive hunting by humans also contributed to their demise. Some suggest human disruption of the environment played a role in their extinction.
Small populations of woolly mammoths may have survived in mainland North America until between 10,500 and 7,600 years ago. The species persisted until 5,600 years ago on St. Paul Island, Alaska, and as late as 4,300 years ago on Wrangel Island, succumbing to extinction from inbreeding and loss of genetic diversity.
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How do scientists learn about mammoths today?
Today, scientists learn about mammoths through various methods, including studying well-preserved carcasses found in the Siberian permafrost. These remains provide insights into their structure and habits. Scientists can collect and sequence DNA from mammoth remains and fossils to study their genetic makeup.
Additionally, carbon-14 dating helps determine the age of mammoth remains, while the study of teeth provides information about their diet and evolutionary adaptations. Cave paintings have also offered insights into the appearance and behavior of mammoths.
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mammoth, (genus Mammuthus), any member of an extinct group of elephants found as fossils in Pleistocene deposits over every continent except Australia and South America and in early Holocene deposits of North America. (The Pleistocene Epoch began 2.6 million years ago and ended 11,700 years ago. The Holocene Epoch began 11,700 years ago and continues through the present.)
The woolly, Northern, or Siberian mammoth (Mammuthus primigenius) is by far the best-known of all mammoths. The relative abundance and, at times, excellent preservation of this species’s carcasses found in the permanently frozen ground of Siberia has provided much information about mammoths’ structure and habits. Fossil mammoth ivory was previously so abundant that it was exported from Siberia to China and Europe from medieval times. Scientific evidence suggests that small populations of woolly mammoths may have survived in North America until between 10,500 and 7,600 years ago. An examination of a fossil tooth discovered in 2015 indicated that a tiny population of mammoths persisted on Wrangel Island, an Arctic island located off the coast of northern Russia, as late as 4,300 years ago before succumbing to extinction from the effects of inbreeding and the loss of genetic diversity. The oldest preserved mammoth DNA, which also has the distinction of being the oldest known animal DNA, dates to more than one million years ago and may belong to a direct ancestor of the woolly mammoth.
Mammoths figured significantly in the art of primitive humans; cave dwellers in Europe realistically depicted herds of these animals. Mammoths were sometimes trapped in ice crevasses and covered over; they were frozen, and their bodies were remarkably well preserved. In fact, cases have been reported in which sled dogs actually were fed the meat from frozen mammoth carcasses that had begun to thaw out of the ice that had held them for almost 30,000 years.
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A variety of distinct species are included in the genus Mammuthus. Most mammoths were about as large as modern elephants. The North American imperial mammoth (M. imperator) attained a shoulder height of 4 metres (14 feet). At the other extreme were certain dwarfed forms whose ancestors became isolated on various islands. Many mammoths had a woolly, yellowish brown undercoat about 2.5 cm (1 inch) thick beneath a coarser outer covering of dark brown hair up to 50 cm (20 inches) long. Under the extremely thick skin was a layer of insulating fat at times 8 cm (3 inches) thick. The skull in Mammuthus was high and domelike. The ears, small for an elephant, were probably adaptively advantageous for an animal living in a cold climate; the smaller amount of exposed surface area diminished heat losses. A mound of fat was present as a hump on the back. This structure is lacking in fossil remains, but evidence for its presence comes from cave paintings. The prominent tusks were directed downward and were very long; in older males they sometimes curved over each other. Mammoth dentition was made up of alternating plates of enamel and a denture that often became worn down by constant back-to-front chewing motions. Remains of arctic plants have been found in the digestive tracts of frozen mammoth carcasses. It is clear that the mammoth was hunted by early North American hunters.