04 November 2015, 12:43 PM ET
Monkeys that are revolted by often disease-carrying things such as poop suggest that disgust drives cleanliness - and health.
04 November 2015, 07:22 AM ET
Bottlenose dolphins swimming in waters affected by the Deepwater Horizon oil spill are dying earlier and birthing fewer calves than dolphins living in other areas, a new study shows.
03 November 2015, 03:26 PM ET
Sixty-six million years ago, a giant raptor with feathered arms chased prey around the ancient South Dakotan landscape, a new study finds.
03 November 2015, 03:09 PM ET
The man-made fires in Borneo have hit orangutans hard, displacing them from their homes and exposing the animals to enough smoke to make them susceptible to respiratory problems.
03 November 2015, 07:01 AM ET
Workers in wasp nests sometimes kill their queens, even though these egg-laying wasps are also their mothers. Now, researchers think they might know why such murders take place.
02 November 2015, 10:50 PM ET
Alpacas are domesticated versions of a South American ruminant called the vicuña. There are no alpacas in the wild.
02 November 2015, 03:45 PM ET
An itsy-bitsy mollusk in Borneo is the new record holder for the world's smallest known snail, a new study finds.
02 November 2015, 11:40 AM ET
Sixty-six million years ago, a tyrannosaur may have sunk its sharp and serrated teeth into the bones of another tyrannosaur, new research suggests.
02 November 2015, 06:53 AM ET
A group of ancient "sea monsters" is caught up in a centuries-old case of mistaken identity, according to new research.
31 October 2015, 12:29 AM ET
The masked bandits of the animal kingdom they live in a wide range of climates and habitats.
30 October 2015, 11:54 AM ET
They're the soil-builders that allow Africa's arid savannas to be lush grasslands. What do they do inside their huge mounds - and how does a collective mind allow them to do it?
30 October 2015, 12:43 AM ET
Wombats are small marsupials that look like a cross between a bear, a pig and a gopher.
29 October 2015, 02:15 PM ET
Scientists have uncovered the fossils of an 11.6-million-year-old primate that lived in what is now a province of Barcelona, Spain, where it walked on tree branches and ate fruit meals. Here's a look at the newbie and the site where it was discovered.
29 October 2015, 02:11 PM ET
The fossil of a small primate with "goggle" eyes that strode atop tree branches, snagging snacks of fruit, suggests the last common ancestor of all apes might have been less like humans' closest living relatives than often thought, researchers say.
29 October 2015, 12:12 PM ET
A teeny-tiny fossilized bird skeleton is helping researchers understand the explosive rate at which birds diversified after the dinosaur age, new research shows.
29 October 2015, 05:24 AM ET
Here are six creepy critters to contemplate as you bob for apples, carve pumpkins and eat copious amounts of candy.
29 October 2015, 02:04 AM ET
Salamanders are amphibians that look like a cross between a frog and a lizard. Species include newts, mudpuppies and hellbenders.
29 October 2015, 01:10 AM ET
Bats aren't always creepy — they can be cute and fuzzy, too.
28 October 2015, 02:39 PM ET
Electric eels have a shocking way of demobilizing their dinner.
28 October 2015, 02:36 PM ET
Scientists record sharp voltage increases as feeding electric eels curl their bodies. These electrical discharge immobilize prey by short-circuiting their neuromuscular system, causing extreme muscle fatigue.
27 October 2015, 03:36 PM ET
If an ancient amphibian lost a limb or a tail, it could simply sprout a new one, according to researchers who found fossil evidence of limb regeneration dating back 290 million years.
27 October 2015, 12:25 AM ET
The dingo is a wild, medium-size canine that has roamed Australia for thousands of years.
26 October 2015, 04:43 PM ET
Nearly a million years ago, a cave hyena could have taken down a 5-year-old mastodon weighing more than a ton. And in packs, the predators may have been equipped to demolish a 9-year-old mastodon weighing a hefty 2 tons.
26 October 2015, 03:00 PM ET
Lions are disappearing from large swaths of the African landscape, largely as a result of conflicts with humans and poaching of their prey species, new research suggests.
26 October 2015, 06:58 AM ET
A little more than 200 million years ago, a four-fanged pterosaur flew over the vast desert of Triassic Utah snagging other reptiles with its toothy mouth, until it met its untimely end on the banks of a dried-up oasis, new research finds.
23 October 2015, 10:24 AM ET
Have you heard that expression "better sleep with one eye open?" Crocs may take that advice to heart.
23 October 2015, 12:29 AM ET
The mongoose is a long, furry creature with a legendary reputation as a ferocious snake fighter.
22 October 2015, 12:25 PM ET
It's a tough trade-off for male howler monkeys: a deeper voice, or more sperm?
22 October 2015, 09:32 AM ET
A new study of the species Alouatta caraya has revealed that the deeper the vocalization, the smaller the testicals. This also led to the conclusions that howler monkeys with low-pitch vocalization tended to live in single-male groups.
22 October 2015, 07:28 AM ET
Photographers and researchers from around the world are teaming up to share images of everyone's favorite Halloween mascots — spiders.
22 October 2015, 07:26 AM ET
It's October, and that can mean only one thing: Time to share awesome spider pictures on social media.
22 October 2015, 12:17 AM ET
Impalas are medium-sized antelopes that are native to Africa. They are great jumpers that use their speed to escape predators.