17 October 2014, 07:42 PM ET
Entomologist Piotr Naskrecki was taking a nighttime walk in the rainforest in Guyana, when he came across a "Goliath birdeater," possibly the world's largest spider.
17 October 2014, 07:37 PM ET
When a shark is caught for sport, it often dies from its injuries — why are sharks not protected the way other animals are?
17 October 2014, 07:09 PM ET
They have a nasty bite!
17 October 2014, 06:20 PM ET
Imagine a spider as big as a child's forearm that weighs as much as a puppy. That's how huge the South American Goliath birdeater — arguably the world's largest spider — can be.
17 October 2014, 03:25 PM ET
They have black skin under their striped hair!
17 October 2014, 07:24 AM ET
Strange vetulicolians were among the earliest animals on Earth. Now, researchers find an anatomical surprise that puts these creatures in their place on the tree of life.
17 October 2014, 03:59 AM ET
Fossils of bizarre, figure-8 shaped creatures called vetulicolians that lived during the Cambrian Period have now been discovered. And they are our cousins.
16 October 2014, 09:50 PM ET
They're the fastest animal on land and they can turn around in midair!
16 October 2014, 07:45 AM ET
Not unlike humans, male tree frogs call on females to begin the mating game, and females prefer long calls.
15 October 2014, 08:00 PM ET
Kangaroos are marsupials native to Australia. Their babies are called joeys and they live in groups called mobs.
15 October 2014, 04:15 PM ET
The ancestors of modern-day kangaroos, giant marsupials with rabbitlike faces, may have walked upright on two feet, sans any hopping, a new study finds.
15 October 2014, 02:00 PM ET
The unassuming rock goby, a small fish that can be found in rock pools around the United Kingdom, southern Europe and North Africa, is a master of camouflage, a new study finds.
14 October 2014, 06:56 PM ET
The rats that dart between trashcans and crawl across subway tracks in New York may harbor some alarming diseases, according to a new study.
14 October 2014, 11:06 AM ET
Rocks found in the deep ocean near methane vents are teeming with microscopic life, new research finds. Microbes live in (and build) these rocks, surviving on the greenhouse gas methane seeping from below the ocean floor.
10 October 2014, 07:47 AM ET
Killer whales are known for their haunting songs consisting of complex whistles and clicks, but they can also learn "dolphin speak," a new study finds.
09 October 2014, 03:10 PM ET
One snake's ability to shimmy up slippery sand dunes made it the perfect subject for a new study aimed at getting robots out of the lab and into the real world.
07 October 2014, 07:22 PM ET
The two-legged beast may have chomped on smaller dinosaurs and lizards some 200 million years ago, while living in an ancient rift valley, dotted with erupting volcanoes and once thought too inhospitable for dinosaur life.
07 October 2014, 09:10 AM ET
The scaly bearded dragon is the first reptile to show it can imitate a peer, and all for the price of a mealworm, new research suggests.
07 October 2014, 07:25 AM ET
An organization that is seeking to get chimpanzees recognized as persons — not things — under New York law is appealing a 2013 decision that denied a captive ape named Tommy a writ of habeas corpus.
06 October 2014, 07:30 PM ET
From the alien-looking and toothy lamprey to the ghoulish aye-aye with its spindly middle finger to the beady-eyed whip spider, here are some of the creepiest-looking and fear-inducing creatures on the planet that you should pet or adore more than leap fr
06 October 2014, 09:55 AM ET
Whooping cranes raised by humans are turning out to be bad parents, and scientists are testing a new method to boost the birds' numbers in the wild.
05 October 2014, 07:17 PM ET
Images of vast swarms of electric-blue sails covering the ocean’s surface and littering the sand are indeed spectacular, but people might well wonder what exactly these strange-looking beings actually are.
03 October 2014, 08:18 PM ET
There are nine subspecies of this largest member of the cat family, all of which are endangered.
03 October 2014, 05:09 PM ET
From frightful to downright odd, evolution has created some strange-looking critters.
03 October 2014, 07:40 AM ET
Instead, human interference in cheetah territory is harming the big cat's ability to find food, the researchers found.
03 October 2014, 02:27 AM ET
With more than 50 percent of wildlife disappearing in the last 40 years, something needs to change.
02 October 2014, 09:20 PM ET
Lions have a fierce roar and roam in prides, you can see pictures and learn more facts here.
02 October 2014, 01:06 PM ET
A newly discovered 52-million-year-old fossil of an "ant-loving" beetle is the oldest example of its species on record, and may help researchers learn more about this social parasite, a new study finds.
02 October 2014, 07:30 AM ET
In a series of arrests from August to September, police caught four people peddling the gills, snouts and other parts of rays, among other grisly animal products.
02 October 2014, 01:43 AM ET
Iceland is expanding whaling, and the United States needs to do more than just protest.
01 October 2014, 10:54 AM ET
After watching a demonstrator lizard open a wired door that led to a mealworm reward (not seen on the video), the lizard successfuly opened the door on its turn.
01 October 2014, 09:56 AM ET
The Humane Wildlife Services were called in when a opossum found himself trapped in a store in Washington, DC. The found the opossum hiding in a bag and malnourished. They took him to an animal shelter for treatment and was released after 6 days.
01 October 2014, 08:43 AM ET
Areas contaminated with anthrax lure grazing animals like zebras, which could lead to new rounds of infections. Anthrax-infected carcasses might release more nutrients into the soil than other carcasses, making the sites attractive to grazers.
01 October 2014, 08:23 AM ET
Brilliant shades of blue and aqua coat the iridescent lips of giant clams, but these shiny cells aren't just for show, new research finds. The iridescent sheen directs beams of sunlight into the interior of the clam, providing light for algae inside.
01 October 2014, 08:17 AM ET
New research reveals that zebras, wildebeest and other wildlife are lured to sites contaminated by anthrax bacterium, possibly aiding in the spread of the infectious disease.
30 September 2014, 07:24 PM ET
This endangered animal is the largest of the great apes.