Wrangel Island Mammoths: The Last Survivors of Their Kind

The Wrangel Island mammoths were the last known woolly mammoths on Earth. Cut off from mainland Siberia by rising seas around 10,000 BC, a small herd lived on this remote Arctic island for roughly 6,000 years and died out only about 4,000 years ago, around 2000 BC. Their bones and ancient DNA have made them a key case study in how small, isolated populations survive and disappear.

An island in the Arctic Ocean

Wrangel Island lies about 140 kilometres off the coast of Chukotka in north-eastern Russia, between the East Siberian and Chukchi seas. It covers roughly 7,600 square kilometres of tundra, low mountains and river valleys, and is today a strict nature reserve known for polar bears and walrus.

During the last Ice Age, sea levels were much lower and Wrangel was part of a vast region of dry, grassy plains, often called the mammoth steppe, that stretched from Europe to North America. As glaciers melted after about 15,000 years ago, the sea rose and flooded the low land. Wrangel became an island, most likely between about 12,000 and 10,000 years ago, trapping a group of mammoths on it.

Discovery of the late survivors

Mammoth bones and tusks had long been noticed on the island. In 1993 the Russian scientist Sergey Vartanyan and his colleagues Vadim Garutt and Andrei Sher published radiocarbon dates in the journal Nature showing that many of the bones were far younger than expected. The animals had lived between roughly 7,000 and 4,000 years ago, well into the Holocene, the warm period that began after the Ice Age.

The result was a surprise. Mainland woolly mammoths had vanished from most of their range by about 10,000 years ago, as part of the wider Quaternary megafauna extinction. Another island population, on St Paul Island in Alaska’s Pribilof Islands, lasted until about 5,600 years ago, but Wrangel held out longer still. The youngest dated remains are around 4,000 years old.

Life on a shrinking world

Hundreds of dated bones now show that mammoths were present on Wrangel more or less continuously from the time of isolation until their disappearance. The island’s tundra offered grasses, sedges and herbs, and the climate remained cold enough for animals adapted to the Arctic.

The first study described the Wrangel animals as dwarfs, and island populations of large mammals often do shrink over generations. Later work found that their size was only modestly reduced compared with mainland woolly mammoths, and the word “dwarf” is now generally avoided. Population estimates suggest a herd of only a few hundred animals at any one time.

What the genomes reveal

Ancient DNA has turned Wrangel into a natural experiment in genetics. A genome published in 2015 by Eleftheria Palkopoulou, Love Dalén and colleagues showed that a Wrangel mammoth carried far less genetic variety than one that lived in mainland Siberia about 45,000 years ago.

In 2017 Rebekah Rogers and Montgomery Slatkin argued that the Wrangel genome carried an unusual number of harmful mutations, including damaged genes linked to smell and other functions. They suggested this “genomic meltdown” was typical of very small populations.

A larger study led by Marianne Dehasque and Love Dalén, published in 2024, compared the genomes of 21 mammoths spanning more than 50,000 years. It concluded that the island population was founded by perhaps as few as eight individuals, grew to a few hundred within about 20 generations and then stayed stable for thousands of years. The most severely harmful mutations were gradually purged, while milder ones built up. Inbreeding alone did not appear to doom the herd.

Why did they disappear?

The final extinction seems to have been fairly sudden, and its cause is still unknown. Suggested explanations include a run of extreme weather, such as icy winters that sealed vegetation under ice, a disease outbreak, or changes in the island’s water and plant life. A 2019 study of bone chemistry led by Laura Arppe explored whether poor water quality might have stressed the animals, but the evidence remains inconclusive.

Humans are not a likely culprit. The earliest known archaeological site on the island, Chertov Ovrag, dates to about 3,600 years ago, a few centuries after the last mammoth dates, and has produced no evidence of mammoth hunting.

Timeline

• c. 15,000–12,000 years ago: Rising seas begin to flood the lowlands of the mammoth steppe.
• c. 12,000–10,000 years ago: Wrangel becomes an island, isolating a small group of mammoths.
• c. 10,000 years ago: Woolly mammoths have largely disappeared from mainland Siberia.
• c. 5,600 years ago: The mammoths of St Paul Island, Alaska, die out.
• c. 4,000 years ago (c. 2000 BC): The Wrangel Island mammoths die out.
• c. 3,600 years ago: Earliest known human presence on the island, at Chertov Ovrag.
• 1993: Vartanyan, Garutt and Sher publish the late radiocarbon dates in Nature.
• 2024: A study of 21 mammoth genomes traces the island population’s genetic history.

By the numbers

Why it matters

The Wrangel Island mammoths show that a famous Ice Age animal outlived the Ice Age by thousands of years, still roaming the Arctic when the Great Pyramid of Giza was built. Their genomes offer rare evidence of how small, isolated populations change over time, a question of direct importance to the conservation of endangered species today.