Pygmy mammoths are descendants of the Columbian mammoth. Tools made from Columbian mammoth remains have been discovered in several North American sites. Asian elephants would do well in the environments previously occupied by the Columbian mammoth. The mammoth was considered to be a Columbian mammoth. The state fossil is the Columbian mammoth. The lifespan of the Columbian mammoth is thought to have been about 80 years. In 1979 a fossilized Columbian Mammoth was found. Columbian mammoth tusks were generally less twisted than those of woolly mammoths. The skeleton of a near-complete Columbian mammoth was among the excavated discoveries there. The most recent Columbian mammoth remains have been dated around 10,900 years ago. For the Columbian mammoth, "M. columbi", the diet was mainly grazing. The Columbian mammoth is the state fossil of Washington and South Carolina. The Columbian mammoth was about tall at the shoulder and weighed about . The Columbian mammoth colonised the Channel Islands and evolved into the pygmy mammoth. Nebraska's state fossil is "Archie", a Columbian mammoth specimen found in the state in 1922.