19 February 2015, 02:06 PM ET
Animals tend to evolve toward a larger body size over time, and marine animals are no exception, a study suggests.
19 February 2015, 10:23 AM ET
Great white sharks may have an even more delayed adolescence than humans, not reaching sexual maturity until they are in their second and third decades, new research shows.
19 February 2015, 06:53 AM ET
In one of the first global species invasions, tropical fire ants spread worldwide by inadvertently hitching rides on 16th-century Spanish ships. Unknowingly, the Spanish were setting up quite a headache for future generations.
18 February 2015, 05:09 PM ET
For the first time in 150 years, researchers have found a new species of sea dragon, a marine creature with "unusual red coloration," according to a new study.
17 February 2015, 04:43 PM ET
Federal officials counted 109 wild Mexican wolves, or lobos, in the Southwest in 2014, up from 83 in 2013. It's the fifth year in a row the small population has grown in the United States.
17 February 2015, 01:35 PM ET
Despite their tuxedo style, when it comes to enjoying food, penguins have poor taste, a new study finds.
14 February 2015, 08:42 AM ET
Valentine's Day may inspire people to buy chocolates for their loved ones or treat their sweetheart to a romantic, candlelit dinner, but animals have entirely different courtship behaviors.
13 February 2015, 12:30 PM ET
DNA tests have confirmed that an endangered gray wolf killed in Utah in December was the same lone wolf that had been spotted and photographed near Arizona's Grand Canyon, the U.S. Fish and Wildlife Service announced this week.
13 February 2015, 08:47 AM ET
Hearts have become iconic symbols of Valentine's Day, but when it comes to hearts in the real world, one size doesn't fit all — particularly in the animal kingdom.
12 February 2015, 11:40 PM ET
While human culture and market experience may play a role in irrational decision-making, it now seems clear that choice biases are much more deeply rooted in our biology.
12 February 2015, 03:35 PM ET
Two new species of early mammals were discovered in China: a horny-clawed tree-dweller and a tunnel digger with shovel-like paws.
12 February 2015, 02:13 PM ET
Researchers have revealed the oldest tree-dwelling mammal ancestor and the earliest known burrowing mammalian. The amazing fossils were discovered in lake sediments in China and date back some 160 million years.
12 February 2015, 12:00 PM ET
Can your dog tell whether you are content or annoyed? Yes, according to new research.
10 February 2015, 07:36 PM ET
See "spot" run, see "spot" walk, see "spot" get kicked and keep on going. Boston Dynamics' newest addition weighs in at about 160 lbs. and uses its sensor head to navigate.
10 February 2015, 02:05 PM ET
Millions of years before LSD and rock and roll, dinosaurs munched on psychedelic fungus, a new study suggests.
07 February 2015, 08:42 AM ET
Killer shrimp, creatures that indiscriminately slay other animals without eating them, may soon join the list of invasive species living in the Great Lakes, a new study finds.
06 February 2015, 02:57 PM ET
The biggest rodent to ever live had large front teeth that it used the way elephants use their tusks, new research shows.
06 February 2015, 06:14 AM ET
In a first-of-its-kind case, a pair of conjoined lizards called Quince monitor lizards were discovered at a German zoo, according to a new report.
05 February 2015, 12:18 PM ET
n 2010, Frek (a Dutch chimp) has high pitched grunts compared to Lucy (an Edinburgh chimp). By 2013, the grunts of Frek and Lucy have become much more similar.
05 February 2015, 12:08 PM ET
Zookeepers at Scotland's Edinburgh Zoo began a fascinating social experiment in 2010: They put a group of chimpanzees raised locally in the Netherlands together with a group of chimps raised in Scotland. This kind of chimpanzee-group mixing almost never o
04 February 2015, 02:02 PM ET
A new species of frog has hopped onto the radar of researchers in Bangladesh. The frogs were discovered after the researchers noticed their unusual breeding habits, according to a new study.
04 February 2015, 02:00 PM ET
The Euphlyctis kalasgramensis frog has been known as Euphlyctis cyanophlyctis for the last 216 years. But they were incorrectly categorized due to "lack of proper study" says researcher M. Sajid Ali Howlader.
03 February 2015, 07:02 PM ET
Colorful monkeys called guenons sport moustaches, nose spots and ear tufts that make it easy to distinguish between different species of guenons. But to the average passers-by, monkeys of the same species might look strikingly similar.
03 February 2015, 12:54 PM ET
Wedged inside rocks in the deep sea off the coast of Western Australia lurks an organism that hasn't evolved in more than 2 billion years, scientists say.
02 February 2015, 07:02 AM ET
Octopus mating involves shifting body colors, detachable "penises," long-distance mating and sexual cannibalism.
30 January 2015, 06:54 AM ET
When black bears attack ant nests in a Rocky Mountain meadow, they help a native plant, rabbitbrush, grow better and produce more seeds.
29 January 2015, 06:35 PM ET
Sarah studies apes, monkeys, humans and other primates to understand how cooperation has evolved over time.
29 January 2015, 04:20 PM ET
Little is known about how baleen whales process low-frequency sounds. Now, researchers have found that baleen whales have specialized skulls that can capture the energy of low frequencies and direct it toward their ear bones to hear.
29 January 2015, 02:00 PM ET
Baby chicks seem to count from left to right just like humans, suggesting the mental representation of the number line is millions of years old.
29 January 2015, 01:06 PM ET
The elusive and rare Sierra Nevada red fox has been spotted in Yosemite National Park for the first time in nearly a century.
29 January 2015, 06:56 AM ET
Once mistaken for another species of owl, the golden-eyed desert tawny owl is finally getting its due, thanks to a new study.
28 January 2015, 02:04 PM ET
Studying seasonality and the ebb and flow of resources helps this researcher predict animal population growth and decline.