Science & Nature
The Fastest Birds In The World
The White-throated Needletail is the fastest in horizontal flight at 170 km/h, while the Peregrine Falcon reaches 389 km/h in dives.
South China Tiger
South China Tiger is the only tiger subspecies extinct in the wild yet still alive in captivity, with no confirmed sighting in about half a century.
What Animals Live in the Atlantic Ocean?
The Atlantic Ocean makes up about 29% of the total world ocean waters. It is home to a wide variety of aquatic plant life and marine animals.
Dingo
Dingo is Australia's largest land predator, a sandy wild canid that howls instead of barks and keeps feral cats, foxes, and rabbits in check nationwide.
Why Uranus Spins Sideways
Uranus is the butt of countless childish jokes, but there are truly interesting qualities to it. Here's why Uranus spins sideways.
Animals With More Than One Heart
Various animals have different heart structures; some, like octopuses and earthworms, have multiple hearts, while others use alternative systems.
Asian Black Bear
Asian Black Bear, or moon bear, is the most tree-climbing of all bears, marked by a pale crescent chest and now Vulnerable to logging and the bile trade.
Which Planet Is The Smallest?
Although the context can change the answer to this question, Mercury is the smallest planet, circling closest to the Sun.
How Long Would It Take To Travel To Each Planet?
Moving at a speed of 50,000-miles per hour, it would take 32-days to reach Venus, the closest planet, and 2,250-days to reach Neptune, the furthest planet.
Mugger Crocodile
Mugger Crocodile is a broad-snouted freshwater crocodile of the Indian subcontinent, known for digging burrows, waiting out droughts, and trekking overland.
Indochinese Tiger
Indochinese Tiger is one of the rarest big cats on Earth, a darker, mid-sized tiger now breeding only in Thailand and Myanmar after a steep decline.
Speed Of Sound VS Speed Of Light
Light is about 880,000 times faster than sound, but the real differences are stranger: what each needs to travel through, and what slows them down.
The 10 US Cities With the Longest Summers
Some US cities barely see winter at all. Ranked by NOAA normals, here are the ten with the longest thermal summers, from Honolulu to Fort Lauderdale.
Banded Sea Krait
Banded Sea Krait is a venomous Indo-Pacific sea snake that hunts eels across the reef yet returns to land to rest, mate, and lay its eggs on shore.
Indian Python
Indian Python is a heavy-bodied, nonvenomous constrictor of the Indian subcontinent, a patient rodent hunter now listed as Near Threatened in the wild.
Which Planet Has The Longest Year?
As the rhyme goes, Mercury is the one, closest to the shining sun. But which planet is furthest, and which has the longest year?
Green Tree Python
The green tree python is a nonvenomous, tree-dwelling constrictor of New Guinea and far northern Australia, famous for its tidy looped resting coil.
Bull Snake
Bull Snake is harmless, yet it hisses, coils, and buzzes its tail like a rattlesnake. The bluff fools coyotes and hawks, and gets the snake killed by people.
Which Planet Has The Deepest Canyon?
The deepest canyon in our galaxy is found on Mars, known as Valles Marineris, which plunges nearly seven miles deep and is 2,400 miles long.
Eastern Brown Snake
Eastern Brown Snake (Pseudonaja textilis) is the world's second-most venomous land snake and the leading cause of snakebite deaths in Australia.
Corn Snake
The corn snake is a calm, nonvenomous rodent hunter native to the southeastern US, and it is one of the most popular pet snakes anywhere in the world.
Which Moons Are Bigger Than A Planet?
Ganymede and Titan are wider than the planet Mercury. Inside the buried ocean, the moon-made magnetic field, and the rule that makes them moons.
Rat Snake
Rat Snake is not one species but a shared way of life among dozens of climbing, rodent-eating constrictors, including the popular pet corn snake.
Piranha
Piranha, the South American freshwater fish with the strongest bite for its size, though these scavengers are far less dangerous than their reputation.
Which Moon Hides The Biggest Ocean Under Its Ice?
Ganymede, Jupiter's largest moon, hides an ocean 60 miles deep beneath 95 miles of ice, likely the biggest body of water in the solar system.
Caribou
Caribou survive the Arctic in herds half a million strong, migrating thousands of miles across the tundra, yet a warming north now threatens their future.
Giant Anteater
Giant Anteater, the largest of the four anteater species, a toothless insectivore with a two-foot tongue that eats up to 30,000 ants and termites a day.
Which Planet Has the Longest Day?
Venus is considered to be the planet with the longest sidereal and solar day in the solar system, lasting around 243 Earth days.
American Bison
American Bison, North America's largest land mammal, once numbered in the tens of millions before near-extinction and recovery as the U.S. national mammal.
Which Planet Is the Windiest?
Discover why Neptune is the windiest planet in the solar system, how fast its winds are, the drivers of its storms, and what scientists still hope to learn.
Mountain Lion
Mountain Lion, cougar, puma, panther, catamount. Guinness lists this cat as the mammal with the most names, more than 40 in English alone, all one species.
Kodiak Bear
The Kodiak bear is the largest brown bear on Earth, a salmon-fed giant found only on Alaska's Kodiak Archipelago, where males can top 1,500 pounds.
Could Earth Ever Have Two Moons?
Earth's Moon is an unerring companion in our night sky. But is it alone? Could the Earth ever have two moons, and if so, what would it look like?
Sumatran Tiger
Sumatran Tiger is the smallest living tiger and the last to survive on an island, with fewer than 400 mature animals left after Bali and Java lost theirs.
Why Don't Stars Twinkle in Space?
Learn why stars twinkle on Earth but shine steadily in space and how atmospheric turbulence affects planets and astronomical observations.
Spectacled Caiman
The spectacled caiman is the most widespread crocodilian in the Americas, a small, adaptable predator named for the bony ridge that bridges its eyes.
Which World Has The Tallest Mountain In The Solar System?
Learn why Olympus Mons on Mars is the Solar System’s tallest known mountain and how it compares with Everest and Vesta’s giant peak.