Wrangel island may have been the last place Woolly Mammoths ("Mammuthus primigenius") existed before becoming extinct. The island is littered with mammoth tusks. A population of mammoths existed here some 6,000 years after they went extinct on the mainland. They lasted until about 1650 BCE, when the Great Pyramids of Giza were already 1000 years old. Archaeological evidence on the island shows them to be a smaller variety, "Mammuth primigenius wrangelensis".