Mammoths
Extinction
Mammoths lived from about 4, 798, 000 BC. The last species of mammoth was the Woolly Mammoth. Most of their population that lived in North America and Eurasia was believed to have died out during the end of the last Ice Age, until recently it was assumed that the last Woolly Mammoths disappeared from Europe and Southern Siberia at about 10, 000 BC, but new discoveries show that some were still here some time near 8,000 BC.
Size
Mammoths were, just like there modern relatives the elephant, quite large. The largest known species of mammoth, the Imperial Mammoth of California reached a staggering height of at least 5 metres (16 feet) from toe to shoulder. Mammoths would probably normally weigh an average of 6-8 tonnes, although some extraordinarily large males may have exceeded 12 tonnes. However, most mammoth species were only about as large as a modern Asian Elephant.
Reproduction
Based on studies of their close relatives the modern elephants, mammoths probably had a 22 month long gestation period. This resulted in only a single calf being born. They probably had the same social structure as that of the Asian and African elephants, with the females living in herds while the males leaded solitary lives or forming loose groups.