25 September 2014, 06:56 PM ET
These endangered beasts are the largest land animals on Earth.
25 September 2014, 12:00 PM ET
Birds didn't evolve in one fell swoop from their dinosaur ancestors, suggests a newly constructed dinosaur family tree showing our feathery friends evolved very gradually, at first.
24 September 2014, 07:09 PM ET
An amazing video from the Florida Keys shows a curious domestic cat nearly become a midnight snack for an American alligator.
24 September 2014, 05:35 PM ET
They're one of the greatest endangered species success stories.
24 September 2014, 03:46 PM ET
The camera trap video shows a curious domestic cat about to get a huge surprise. A Florida alligator nearly catches the feline in its fearsome jaws. Alligators live in wetlands throughout the Lower Florida Keys.
24 September 2014, 02:14 PM ET
Take a closer look at these caterpillars, bugs, moths, wasps and butterflies to learn more about insects found in the eastern half of the United States.
24 September 2014, 02:13 PM ET
Mexican cavefish saves energy by ditching circadian rhythm.
24 September 2014, 01:21 PM ET
Mysterious fossils found in southern China are not bacteria or protists, but multicellular creatures, new research finds. The tiny fossils might even be the embryos of some of the earliest animals on Earth.
24 September 2014, 01:01 PM ET
Multicellular spherical fossils dating back 600 million years were discovered in South China's Doushantuo Formation. Here are photos of these bizarre specimens.
24 September 2014, 07:05 AM ET
The common octopus can be a cannibal, sometimes dining on members of its own species, showing a taste for the victim's arm tips. Now, divers have caught this octopus-on-octopus action in the wild for the first time on video.
24 September 2014, 06:56 AM ET
Video and images show for the first time a record of octopus cannibalism, revealing the common octopus in three encounters cannibalizing a smaller octopus in the Atlantic Ocean off Spain.
23 September 2014, 08:01 PM ET
An adult octopus hides out in its cave while devouring a smaller octopus, before swimming away. This is one of the first documented observations of octopus cannibalism.
22 September 2014, 04:30 PM ET
Penguins are torpedo-shaped, flightless birds that live in the southern regions of the Earth.
22 September 2014, 01:10 PM ET
The plant-eating dinosaur, which sported some of the largest nasal passages of any dinosaur, may have been killed by a giant crocodile 75 million years ago. The croc attack would have led to the quick death and burial of the beast.
19 September 2014, 08:01 AM ET
The famous giant tortoise, Lonesome George, holds his head high, even in death.
19 September 2014, 07:36 AM ET
The body of a 100-year-old Pinta Island Tortoise, dubbed Loneseome George, has been preserved and is now on display at the American Museum of Natural History.
18 September 2014, 02:03 PM ET
Flamingos are large birds with long necks, sticklike legs and pink or reddish feathers. The colors of the feathers come from pigments found in their food.
18 September 2014, 01:03 AM ET
Some turtles and their young talk — albeit at low frequencies.
17 September 2014, 04:22 PM ET
Ostriches are large, flightless birds that live in the dry, hot savannas and woodlands of Africa.
17 September 2014, 02:13 PM ET
A new, 54-year study suggests coordinated aggression is innate to chimpanzees, and is not linked to human interference.
17 September 2014, 01:30 PM ET
Chimpanzees may attack each other in coordinated assaults, but not because of human pressures on their habitat, a new study finds. Instead other factors, such as having many males in a highly populated ape community, heighten aggression rates.
17 September 2014, 10:56 AM ET
A little goldfish just underwent a big operation. The pipsqueak, named George, had a life-threatening tumor removed from his head last week at the Lort Smith Animal Hospital in Melbourne, Australia.
17 September 2014, 10:42 AM ET
A small goldfish, named George, underwent surgery at the Lort Smith Animal Hospital in Melbourne, Australia, to remove a life-threatening tumor from his head.
16 September 2014, 07:01 PM ET
Sharks might not be able to adapt to acidified ocean water if climate change continues as-is, new research suggests. Exposure to ocean acidification changed sharks' nighttime swimming behavior.
16 September 2014, 06:49 AM ET
Scientists found traces of scavenging on the bones from a fossilized ichthyosaur from the late Jurassic.
15 September 2014, 10:12 PM ET
The giant beast is being housed in New Zeland and scientists hope the autopsy will help to answer some of the mysteries surrounding the colossal squid.
15 September 2014, 03:40 PM ET
MIT's new robotic cheetah isn't as speedy as its wild counterpart, but it is stealthy and surprisingly agile.
15 September 2014, 10:15 AM ET
MIT researchers have assembled a robotic feline that weighs about the same as its real-life counterpart. It reached its current top speed during indoor track experiments.
12 September 2014, 03:28 PM ET
Good news for shark lovers: This weekend, new international laws will go into effect to strengthen protections for five shark species that are threatened by overfishing.
11 September 2014, 10:37 PM ET
Swimming together, stunning reef sharks show their social side.
11 September 2014, 09:59 PM ET
Sharks are not simple-minded killers — in fact, many tend to be social, with individual personalities.
11 September 2014, 03:19 PM ET
By examining leopard poop in rural India, scientists discovered that the big cats have a surprising favorite food: domestic dogs.