08 July 2014, 02:00 PM ET
A single gene that controls male and female sexes in one organism evolved from a simpler precursor gene in a unicellular algae, new research suggests.
08 July 2014, 09:24 AM ET
A "world-class" dinosaur track site discovered within Denali National Park shows herds of duck-billed dinosaurs once tramped through muddy rivers in family groups.
08 July 2014, 09:16 AM ET
Dinosaur hunters discovered thousands of tracks from a herd of duck-billed dinosaurs, or hadrosaurs, in Alaska's Denali National Park. Here are images of the spectacular fossil find.
07 July 2014, 03:02 PM ET
The largest flying bird known to ever have lived has now been revealed, an extinct giant with a wingspan more than twice as big as that of the largest living flying bird. The bird, researchers say, is like something out of a fantasy novel.
07 July 2014, 03:01 PM ET
This extinct flier would've sported a wingspan of some 17 feet across, gliding through the skies about 25 million years ago and taking out prey with toothy projections from its jaw.
07 July 2014, 09:01 AM ET
The colorful and aggressive mantis shrimp evolved a new way to use a naturally occurring, biological sunscreen: The animals use this compound to filter light from their eyes.
03 July 2014, 10:41 AM ET
Kangaroos get around more often by walking than by hopping. And when they walk, four legs aren't enough, as these 'roos use their tails as a fifth leg to help them along.
03 July 2014, 07:16 AM ET
Kangaroos are the first known animal to use their tails as extra legs while walking, new research finds. The tail helps kangaroos push off and redirect the body mid-stride.
02 July 2014, 03:14 PM ET
The 'Walking Dead' and 'Fury' star want to change the negative perception people have about pit bulls. He sits down with the Humane Society's CEO Wayne Pacelle to talk about it.
02 July 2014, 02:58 PM ET
A newly discovered species of spider-hunting wasp has been keeping a gruesome secret: It stuffs the corpses of dead ants into the walls of its home. The new creature has been named the "bone-house wasp."
02 July 2014, 01:47 PM ET
A red kangaroo walks at the Fowlers Gap Arid Zone Research Station in New South Wales, using its tail as a sort of fifth leg.
01 July 2014, 07:30 PM ET
Lambs who experience early life pain may have more painful labors and give birth to unusually sensitive lambs, a new study finds. The research is one of many studies that find long-lasting effects of early life experience.
01 July 2014, 07:02 PM ET
Genetic analysis of hair samples thought to come from Yeti or Bigfoot sightings around the world actually come from known animals, a new study suggests.
01 July 2014, 07:00 PM ET
Fish can remember the location of food at least 12 days after last being there, suggesting they have longer memories than previously thought.
01 July 2014, 06:22 PM ET
A fishing spider; a golden-web-spinning spider; and some of the world's largest tarantulas are among the cast of arachnids on display for those adventurous humans hoping for a close encounter with these smart, eight-legged creepy-crawlies.
01 July 2014, 05:06 PM ET
An elephant's bladder can hold nearly 5 gallons (18 liters) of fluid, and yet, it can pee just as quickly as a cat. A new study reveals that most mammals larger than rats urinate for about the same amount of time: 21 seconds.
01 July 2014, 11:30 AM ET
New research suggests Chilean devil rays warm themselves in the sun at the surface then dive down to extreme depths in search of food.
01 July 2014, 08:11 AM ET
Intersex fish have been found in three Pennsylvania river basins, suggesting that the waters may be tainted with endocrine-disrupting chemicals from agricultural runoff and treated human waste, according to a new study.
01 July 2014, 04:00 AM ET
Scientists have identified nearly 45,000 spider species, but estimate that there are as many yet to be discovered. Here are some of the most popular and most dangerous spiders.
30 June 2014, 10:59 AM ET
As climate change melts sea ice, emperor penguin populations across Antarctica across Antarctica could drastically decline, with many of the colonies dropping by more than half by 2100, warn scientists.
29 June 2014, 09:05 PM ET
The aim of the study was to assess the differences in the distribution and abundance of brown hyaena between protected and unprotected farmland areas in South Africa.
29 June 2014, 10:43 AM ET
Koalas may be cute and cuddly, sleeping 18 to 22 hours a day, but they can become vicious when it's time to get down to business. Here's a look at how the marsupials mate.
29 June 2014, 09:53 AM ET
A new database of dinosaur-era flying reptiles called pterosaurs allows users to map the location of fossils on Google Earth. Paleontologists want to use the database, called PteroTerra, to uncover evolutionary trends.
29 June 2014, 01:25 AM ET
From toilet tests to pool covers, it's not hard to tweak your home to save water.
27 June 2014, 12:56 PM ET
A new study that tested the musical taste of chimps found that the animals shun the steadily strong beats common in Western genres, but they're drawn to Indian ragas and traditional tunes from West Africa.
27 June 2014, 11:54 AM ET
Squirrels are nimble, bushy-tailed rodents found all over the world. There are more than 200 species of squirrels.
27 June 2014, 11:47 AM ET
A new, tiny species of elephant shrew, also called a round-eared sengi, has been discovered in an ancient volcanic region in the Namib Desert in Africa. The creature sports a trunk-like snout and a weird scent gland on the underside of its tail.
27 June 2014, 08:56 AM ET
Teeny-tiny baby stegosaurus tracks have been digitized and turned into a 3D model, along with tracks from adult stegosauruses. The models should help researchers compare and contrast dinosaur tracks.
27 June 2014, 03:29 AM ET
Almost a third of Australia’s mammals have become extinct or are facing extinction, largely thanks to introduced predators such as cats and foxes. But what is the best way to save the species still alive?
27 June 2014, 01:52 AM ET
Papadum is more than a cute goat — he's now part a reference genome for his breed.
27 June 2014, 01:31 AM ET
Dogs do have a unique way of seeing the world. But despite what you might have heard, the canine perspective isn't black and white.
26 June 2014, 03:54 PM ET
What may be the world's oldest reef built by the earliest known skeletal animals has been discovered in Namibia. Take a photo journey through the reef, where you can see the fossilized remains of the reef-building animals and their natural cement.