Columbian mammoth

Columbian mammoth, Mammuthus columbi
Up to 13 ft. tall, up to 10 tons, lived 100,000 - 13,000 years ago
Range: North America (Alaska to central Mexico) 

The Columbian mammoth is one of three species of mammoths that roamed continental North America during the Ice Age. The other two species were the woolly  mammoth and Jefferson's mammoth. These two species preferred tundra environments whereas the Columbian mammoth was more a savanna and grasslands inhabitant. Mammuthus excilis was a pygmy mammoth that lived on the Channel Islands off the coast of California. The largest Columbian mammoths ranged from 12-13 feet  (4 meters) high at the shoulders, and weighed as much as eight to ten  tons (nine metric tons). The tusks of the Columbian mammoth were up to 14 feet (4.25 meters) long, and its washboard-like teeth were well-suited for chewing grass. 

American mastodon, Mammut americanum
Up to 10 ft. tall, up to 8 tons, lived 5  million years ago - 13,000 years ago
Range:  North America (Alaska to central Mexico) 

Mastodons were distant relatives of mammoths and elephants. In North America, they were generally smaller but more massive than mammoths, standing about 8-10  feet tall at the shoulders and weighed 6-8 tons. Unlike the washboard-like teeth of mammoths, mastodons had blunt, cone-shaped teeth that were probably used to chew leaves, fruits and stems  in wooded areas. African elephant (for comparison), Loxodonta africanaUp to 11 ft. tall, up to 8 tons, lived 5  million years ago to present

Mammoths (Mammuthus) and elephants (Loxodonta) both evolved and lived together in Africa for four million years.  Mammoths dispersed to North America around two million years ago.  Mammoths became a cold adapted form of elephant.

Mammoth Teeth vs. Mastodon Teeth
Mammoths and mastodons are superficially similar to modern elephants. One obvious difference between them  is the shape of their teeth: mastodons had conical projections on the crowns of their molars, which were adapted for browsing, while mammoths were grazers, and their flat molars had shallow ridges, adapted for grinding coarse grasses. Mammoth teeth are somewhat similar to the teeth of modern elephants.

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