Biological pollution caused by alien species' invasion is a threat to the existence of indigenous species.
Wildlife conservationists have listed more than 82,000 species racing towards extinction.
Cheetahs, the world's fastest mammals, are racing toward extinction because of human development.
Giraffes qualify at the "vulnerable to extinction" in the recent study.
The black-flanked rock wallabies that have been spotted by mountain climbers are rising in numbers and survived extinction.
Stephen Hawking hinted that an asteroid might cause the end of the world in a thousand years.
Mathematician's shocking calculation showed doomsday could happen at any time and the odds are growing larger by the moment.
Experts advise on how to avoid the prediction of Stephen Hawking.
Summers Place Auctions announced its Dodo skeleton auction next week. It expects to sell for more than £500,000.
Lunar craters may hold the key to learning more about the Earth's history, particularly the dinosaur extinction.
The Grauer's gorillas are at great risk of extinction since the population is continuously decreasing over the past 20 years.