12 December 2014, 03:13 PM ET
Birds — like anteaters, baleen whales and turtles — don't have teeth. But this wasn't always the case. The common ancestor of all living birds sported a set of pearly whites 116 million years ago, a new study finds.
12 December 2014, 06:12 AM ET
A sex-changing California fish is growing bigger and gobbling up more sea urchins after a decade of protection, a new study finds.
12 December 2014, 12:47 AM ET
Rattlesnakes are found throughout North and South America. Their distinctive rattle warns intruders to stay away!
11 December 2014, 10:24 PM ET
Funnel-web spiders build funnels out of their webs. Some of these spiders are among the most venomous in the world.
11 December 2014, 02:00 PM ET
A new family tree of the world's bird species may be the most complete one ever made, and reveals some surprising relationships, as well as showing how characteristics such as birdsong evolved.
10 December 2014, 11:54 PM ET
Fish have feelings, birds get pessimistic and octopuses love to play.
10 December 2014, 09:16 PM ET
Garter snakes are some of the most widespread snakes in North America. They can be found from Florida to Alaska.
10 December 2014, 02:05 PM ET
A skull of a small, crow-size dinosaur found in Montana, the oldest horned dinosaur ever found in North America, suggests that these dinos migrated from Asia to North America between 113 million and 105 million years ago.
10 December 2014, 02:01 PM ET
A fossilized skull unearthed in Montana is the oldest horned dinosaur on record in North America, a new study finds.
10 December 2014, 01:30 PM ET
Some of humanity's greatest technologies were inspired by animals. Now, scientists, inspired by the movement-sensing organ of a spider, have developed a wearable sensor that can detect music, recognize speech and monitor a person's heart rate.
10 December 2014, 11:16 AM ET
The deep ocean is home to some truly unusual creatures.
10 December 2014, 07:11 AM ET
Two new species of pseudoscorpions has been discovered in a pitch-black Grand Canyon cave.
10 December 2014, 06:57 AM ET
A salamander tadpole with two seemingly functional heads is born in Israel, and researchers are speculating that environmental pollutants or random mutation may have caused the defect.
10 December 2014, 01:45 AM ET
Squirrels are highly excitable creatures, but new research indicates that stress is actually good for their babies.
09 December 2014, 10:30 PM ET
Thick plates protected this massive dinosaur from predators.
09 December 2014, 07:14 PM ET
An international partnership called the Central African Biodiversity Alliance (CABA) has begun creating a "framework" to conserve thousands of species in the Congo Basin.
09 December 2014, 03:04 PM ET
A bizarre fossil found in China looks like a bird's nest but is actually the remains of an animal shaped like a spiny balloon. The creature appears to have no living evolutionary descendants.
09 December 2014, 02:57 PM ET
How much do you know about creepy and crawly spiders?
09 December 2014, 01:48 PM ET
In central Africa, one of the world’s richest biological hotspots, an international group of scientists is working to preserve biodiversity as the climate warms.
09 December 2014, 01:00 PM ET
The world's most endangered porpoise could go extinct in four or five years if the Mexican government doesn't step up enforcement against illegal fishing.
09 December 2014, 01:00 PM ET
Illegal gillnet fishing in the Gulf of California is driving the vaquita, a tiny, critically endangered and elusive porpoise, to extinction.
09 December 2014, 12:28 PM ET
Inbreeding, poaching, a lack of herders and climate change are contributing to the iconic animal's decline.
09 December 2014, 12:06 AM ET
Research has shown that squirrels exposed to stress hormones grow larger faster, improving survival chances.
08 December 2014, 09:46 PM ET
Stegosaurus' distinctive features make it one of the most recognizable dinosaurs.
08 December 2014, 03:00 PM ET
X-ray video and high-tech computer simulations of a modern bird making tracks reveal the secrets of dinosaur footprint formation.
08 December 2014, 10:01 AM ET
Measurements of bone movement on x-ray video taken as guineafowl made footprints shows how dinosaurs may have walked 250 million years ago.
05 December 2014, 09:10 PM ET
Pandas romp in a range of environments, not just one type of forest.
05 December 2014, 08:39 PM ET
Pandas are not as picky as once thought.
05 December 2014, 07:00 PM ET
A great horned owl went for an unexpected swim in Lake Michigan this week, after two peregrine falcons forced it into the water, according to Chicago birders who saw the territorial skirmish firsthand.
05 December 2014, 12:09 AM ET
Scientists have discovered that electric eels use shocks to “remote control” their prey, causing involuntary spasms that reveal the target’s location and prevent its escape.
04 December 2014, 05:58 PM ET
The panda, whose behavior is being studied, was caught munching on some bamboo at the Wolong Nature Reserve in southwestern China.
04 December 2014, 04:34 PM ET
Tommy the chimpanzee was denied a writ of habeas corpus and will not be recognized as a legal person by a New York state appeals court.