Endangered species are animal popluations that are at risk of extinction. Natural extinctions do occur, but human beings play an integral role in animal extinction and preservation.
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Sometimes organisms, thought to be long gone from the world, rise from extinction like Lazarus from the dead, though it is a rare occurrence.
This long-fingered primate with the perpetually startled golden eyes is considered one of the most distinctive animals on Earth.
The axolotl can regenerate virtually any of its limbs or organs and has a face that's totally irresistible.
A new study reports that the U.S. Endangered Species Act has helped marine mammal and sea turtle populations to significantly regenerate.
Sure, he could pummel all his fellow beasts in a brawl, but could he stand the test of time?
By Robert Lamb
There is only one tiger species, but new research reports the existence of six subspecies — information that could help us save these dwindling predators.
Milkweed is the only thing a monarch butterfly eats. Their numbers are dwindling, but this common backyard weed could save them.
Scientists discovered some new chameleon species with some very colorful characteristics.
Only two female northern white rhinos remain after the passing of Sudan, the last male of its subspecies.
Panda populations are flourishing, and that's good news. But with the threats of infrastructure and livestock, can that trend last?
After 42 years of protection, the Yellowstone grizzlies will lose their status. Critics worry the bears could become targets for trophy hunter.
Farming, prey decline, illegal trading and legal hunting all threaten the charismatic but secretive big cats.
Social media couldn't save Cecil the Lion. But the outrage at his death may be helping save other endangered animals and species.
These fish are some of the most endangered in the world. Overfishing and consumer demand are just two of the reasons they may not be around for much longer.
By Nicole Gugliucci
The Gulf oil spill mutilated tons of habitat for innocent animals and compromised the health of so many others. Read about the Gulf oil spill and learn about its devastating effects.
Meet giant pandas, Mei Xaing and Tian Tian. Learn how the crew at the National Zoo enrich Mei Xaing and Tian Tian's diets.
Learn about the zookeeper who cares for Mei Xaing and Tian Tian. Mei Xaing and Tian Tian are the giant pandas babies at the National Zoo.