05 November 2014, 02:51 PM ET
New research shows how external genitals arose from very different starting places for reptiles and mammals.
05 November 2014, 02:47 PM ET
Dinosaurs that lumbered around the ancient supercontinent Gondwana had a warm-blooded neighbor — a "chewing machine" with big eyes, excellent hearing and an acute sense of smell, according to a new study.
05 November 2014, 02:44 PM ET
The finding of a well-preserved skull of a new species, called Vintana sertichi, in Madagascar provides new insights into these mysterious mammals.
05 November 2014, 01:17 PM ET
A 248-million-year-old fossil of an ancient reptile found in China is the oldest known member of a well-known group of marine reptiles, and may have lived both on land and in the sea.
05 November 2014, 10:56 AM ET
A large dinosaur, raccoon-size mammal and crocodile-like creature all walked toward a freshwater lake during the Early Cretaceous 118 million years ago, leaving their footprints behind in a sedimentary band of earth.
05 November 2014, 10:55 AM ET
A new finding of 118-year-old footprints of an early mammal, crocodile and dinosaur are helping researchers learn more about these ancient animals that lived in present-day Angola.
05 November 2014, 09:25 AM ET
Rovers — especially cute ones that are disguised as penguin chicks — seem to be better at spying on penguins than humans are.
04 November 2014, 08:46 PM ET
There are 40,000 types of spiders in the world. All of them bite, but spider bites are rarely deadly.
04 November 2014, 04:21 PM ET
A century ago, scientists unearthed fossils of a gigantic carnivorous dinosaur bigger than Tyrannosaurus rex in the Sahara desert, but until recently, paleontologists thought the fearsome beast was lost to history.
04 November 2014, 01:50 PM ET
To keep wild King Penguins from stressing out, researchers piloted a rover to collect data from Passive Integrated Transponders tags (PIT-tags).
04 November 2014, 12:08 PM ET
Contrary to an urban legend, there are not as many rats as people in New York City, a new study shows. A statistician says a generous estimate for the rat population would be 2 million — far fewer than New York's 8 million people.
03 November 2014, 04:08 PM ET
Rare fanged musk deer were spotted in Afghanistan for the first time in 60 years.
01 November 2014, 01:08 AM ET
Can you get Ebola from your pets?
01 November 2014, 12:54 AM ET
Monarch butterflies are disappearing, in large part due to milkweed loss tied to the rise in genetically modified crops, but voters in Oregon and Colorado have a chance to counter that trend on Nov. 4.
31 October 2014, 11:45 PM ET
By removing the horn, we remove the motive for poaching.
31 October 2014, 11:42 PM ET
Great white sharks are the largest predatory fish. Often thought to be man-eaters, they are actually responsible for only five to 10 attacks on humans per year.
31 October 2014, 10:22 PM ET
The large carnivorous dinosaur reigned during the late Cretaceous Period, 65 million years ago.
31 October 2014, 02:26 PM ET
A wayward gray wolf has been spotted several times this month around the North Rim of Grand Canyon National Park. It could be the first of its species to roam Arizona in 70 years.
30 October 2014, 11:51 PM ET
Spinosaurus was even bigger than Giganotosaurus and Tyrannosaurus.
30 October 2014, 11:48 PM ET
They may look slow and lumbering, but these amphibious beasts can be intimidating!
30 October 2014, 05:32 PM ET
Wandering around the windowsills and kitchen floors of New England is a common spider with a surprisingly nasty bite.
30 October 2014, 03:44 PM ET
Halloween is a time to celebrate mythical creatures that haunt our dreams, but some of these beasts have real-life counterparts in the animal world.
30 October 2014, 02:08 PM ET
A deadly new fungal disease that originated in Asia is killing salamanders and newts in Europe and could soon land on U.S. shores, home to the most diverse population of salamanders worldwide.
30 October 2014, 01:07 AM ET
In elite racehorses, biology is pushed to the limit, it’s not surprising then that injuries most commonly occur where the highest loads are generated.
29 October 2014, 09:12 PM ET
Black widows are spiders that are known for the females' unique appearance and tendency to eat their mates.
29 October 2014, 01:06 AM ET
Local heroes are looking out for animals as Ebola spreads through West Africa.
28 October 2014, 10:18 PM ET
They're the tallest animal on Earth with necks that are 6 feet tall!
28 October 2014, 03:09 PM ET
Mammoth bones more than 70,000 years old emerged from the eroded river banks of a reservoir in Idaho this month. Paleontologists and students raced to rescue part of the beast's skull and a tusk, but they suspect more lies below the surface.
28 October 2014, 02:58 PM ET
A mammoth skeleton was discovered this month on the banks of a reservoir in Idaho. Paleontologists have rescued part of its skull and a tusk, but there could be a lot more buried below the surface.
28 October 2014, 02:32 PM ET
The loss of so many large species, such as woolly mammoths and saber-toothed cats, around 12,000 years ago could help researchers predict what will happen as mammals such as elephants, rhinoceroses and tigers disappear today.
28 October 2014, 02:05 PM ET
Once down to only 15 animals, giant tortoises on Espãnola, a tiny Galápagos island, now number about 1,000, making the reptile one of conservation's greatest success stories.