The Woolly Mammoth (Mammuthus primigenius) is a species of mammoth. This animal is known from bones and frozen carcasses from northern North America and northern Eurasia with the best preserved carcasses in Siberia. Unlike most other prehistoric animals, their remains are often not literally fossilized, turned into stone, but rather are preserved in their organic state. This is due in part to the frozen climate of their habitats, and to their massive size. Woolly mammoths are therefore among the best-understood prehistoric vertebrates known to science in terms of anatomy. This animal appeared during Cenozoic era, the most recent era of geologic time, from about 65 million years ago to the present. The climate was warm and tropical toward the beginning of the era and cooled significantly in the second half, leading to several ice ages. Humans first appeared near the end of this era. Originally captioned: Woolly Mammoth found in Siberia, 1903. The goods imported from Siberia to China included the tusked of mammoths, whose bodies were found perfectly preserved in frozen soil. The Chinese ground the prehistoric ivory to make a medicinal powder, which was considered to be a miraculous cure for various diseases.