Mastodons are thought to have first appeared almost four million years ago. They were native to both Eurasia and North America but the Eurasian species Mammut borsoni died out approximately three million years ago - fossils having been found in England, Germany, the Netherlands, Romania[1] and northern Greece. Mammut americanum disappeared from North America about 10,000 years ago, at the same time as most other Pleistocene megafauna. It is known from fossils found ranging from present-day Alaska and New England in the north, to Florida, southern California, and as far south as Honduras.