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www.reference.com/science/causes-extinction-e3407e6ad7a8bb1

The heating and cooling of the earth, changes in sea level, asteroids, acid rain and diseases can all be natural factors that cause a species to become extinct. Humans can also be the cause of extinction for certain species.

www.reference.com/article/big-elephant-c548459b9d2b83be

The size of an elephant depends on the elephant's age, gender and type; the largest elephant was an adult male African elephant who weighed approximately 24,000 pounds and stood 13 feet tall at the shoulder. Most African elephants stand from 8.2 to 13 feet tall at the shoulder.

www.reference.com/article/elephants-found-e6af466a5c40b7fe

Depending on the species, elephants are found naturally in Africa and Asia. African elephants are found in most parts of Africa, while Asian elephants are mostly found in the tropical forests in Asia, such as in India, Thailand and Indonesia.

www.reference.com/article/many-elephants-world-5061661fde0c6898

As of July 2014, there are between 450,000 and 700,000 African elephants in the world, and between 35,000 and 40,000 Asian elephants, according to Defenders of Wildlife. Both species are threatened not only by habitat loss, but also by poaching for the illegal ivory trade.

www.reference.com/article/two-species-elephants-56385fdef8101d63

The two species of elephants are the African species and the Asian species. African elephants are further divided into two subspecies: forest and savanna. There are four subspecies of Asian elephants: Sri Lankan, mainland, Borneo and Sumatran.

www.reference.com/pets-animals/elephants-live-72120b0e02360079

There are two species of elephants: the Asian elephant, which lives in south and southeast Asia, and the African elephant, which lives in sub-Saharan Africa. The can be found living in the tropical forests, woodlands and savannahs of these regions.

www.reference.com/article/eats-elephant-43c5a693cbcd469

Elephants lack natural predators in nature, largely as a result of their size. They are too big for most would-be predators to take down safely and eat. Humans are the primary predator of elephants, as people still hunt elephants for their ivory, meat and bones.

www.reference.com/science/definition-extinct-species-535b302e2e49110

An "extinct species" is a species of organism that can no longer be found in the wild or in captivity. A species is a classification of organisms which can reproduce successfully with one another.

www.reference.com/article/animals-extinct-list-ab38d18fbfaa594a

Given that the Earth has experienced no fewer than six mass extinctions over the last 500 million years, the list of species that once lived but have gone extinct over the ages is vast. As of 2014, the Center for Biological Diversity (CBD) reports that Earth is undergoing its sixth mass extinction,

www.reference.com/article/white-elephant-bde7462e6422e9fc

According to the Oxford Dictionaries, a "white elephant" is a possession that is expensive and hard to maintain but also difficult to get rid of. For example, it may be used in reference to a house or car that requires a lot of upkeep and cannot be sold because no potential buyers can be found.