Two species that are saved from extinction.

..AMERICAN BISON..

American bison is often mistakenly called buffalo. Bison is the members of the bovine family. During 19th century more than 50 million bison were killed by settlers. Bison were killed for food, sport and to deprive Native Americans their most important natural asset. By 20th century, the number of bison have dropped drastically that only 750 left on earth. in 1905, American Bison Society conserved lands for captive breeding of bison. Now, there are estimated 350,00 bison on earth

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You can also refer here.(http://animals.nationalgeographic.com/animals/mammals/american-bison/)




..BLUE POISON DART FROG..

These frogs are nearly vanished from this world due to high demand in international pet trade. Due to its bright flashy color, it is easy to hunt them in the jungle. People often caught this type of frog because of the powerful venom. A two-inch long frog venom can kill 10 grown men. The venom is used for centuries to tip the hunter's blowgun darts when hunting. This frog leaped back from extinction when they are being protected by collectors, captive breeding and conservation in their habitat at South America.

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For info on poison dart frog, you can find it here.(http://animals.nationalgeographic.com/animals/amphibians/poison-frog/)