Woolly mammoths were large, hairy relatives of modern elephants that roamed the cold tundras of the northern hemisphere during the last Ice Age. They had long, curved tusks and thick fur, which helped them survive in freezing temperatures. These magnificent creatures could weigh up to 6 tons and stood about 13 feet tall at the shoulder. These ancient animals primarily fed on grasses, shrubs, and other vegetation. Sadly, woolly mammoths went extinct around 4,000 years ago, likely due to a combination of climate change and hunting by early humans. Today, scientists study their remains to learn more about their lives and the ecosystems they inhabited, as well as to explore the possibility of bringing them back through genetic engineering.