The animal known for its ability to survive in extreme temperatures is the tardigrade, also known as the water bear. Tardigrades are microscopic creatures that can endure some of the harshest environments on Earth, including extreme heat, freezing cold, high radiation, and even the vacuum of space. They achieve this remarkable resilience by entering a cryptobiotic state, allowing them to essentially shut down their metabolism and survive without water for years. Upon rehydration, tardigrades can return to activity, showcasing their incredible adaptability. Their unique survival mechanisms have made them a subject of scientific study in understanding life's limits and potential extraterrestrial life.