Cactus plants, with their needles and ability to withstand droughts, seem hearty, but many are threatened with extinction.
The asteroid and volcanoes that did in the dinos was no match for a family of super tough beaver-like mammals.
The deep-sea dweller, long thought extinct, has a vestigial lung lurking in its abdomen.
When a northern white rhino died in the Czech Republic recently, it left four remaining -- on the entire planet! Julia explains the science behind how animals are deemed to be extinct or endangered.
The never-before seen, and now extinct, species confirms that the creatures once lived in the Caribbean, where they are not found today.
Dominant species spread across the globe are just as vulnerable during a mass extinction event as more fragile ones confined to a single locale.
Nabiré, a 31-year-old female northern white rhino, died of a ruptured cyst, authorities at a Czech Republic zoo announced.
Likely evolved from land reptiles that dove into the ocean about 248 million years ago, the ichthyosaur extinction has stumped scientists for years.
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