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Aquatic mammals such as whales and dolphins live and feed in the ocean. The Blue Whale is the biggest mammal on Earth.
Canines have pointed snouts and a use their large, conical teeth for tearing and grinding their food. See how dogs and other canines work in our collection of canine articles.
Small carnivores help control the populations of rodents, snakes and insects. Small carnivores include animals like weasels, wolverines, minks and badgers.
Primates are placental mammals that include gorillas, monkeys and chimpanzees, as well as humans. Other than humans, primates are found mostly in Central and South America, Africa, and South Asia.
Bears are part of the Mammalia Class and are within the order Carnivora. There are only 8 living species of bear and each has stocky legs a long snout, thick shaggy hair and five non-retractile claws.
How Polar Bears Work
The polar bear's shocking whiteness, ferocity and sheer size make it an icon of purity and power. How do these animals survive in a frigid climate?
Why don't Pandas hibernate?
They call the creature a bear. And bears are known to hibernate each winter. So why don't pandas slip into the same cold-weather stupor? Are they really even bears at all?
Why is the birthrate so low for giant pandas?
Since 1990, there have been only five panda cubs born in the United States. This may seem a little low. Getting pandas to mate in captivity is extremely difficult. Why is the birth rate for giant pandas so low?
15 Tips for Surviving a Bear Encounter
Bears are typically just as scared of us as we are of them. Knowing more about the behavior of bears can help you to understand why a bear would attack in the first place. Respect their boundaries and use these 15 tips for surviving a bear encounter.
A bear is a large, heavily built mammal with shaggy fur and a short tail.
A Panda is a type of two mammals in Asia.
Polar Bears (Video)
Learn more about polar bears in this video from Discovery.
Bears Go Fishing (Video)
Jeff Corwin, host of Animal Planet's hit show, the Jeff Corwin Experience, watches a bear feed from a stream.
Panda Bear Birth (Video)
Watch this Reuters video to see one of the most amazing things you'll ever see -- the birth of a newborn giant panda. OK, so he wasn't giant when he was born, but he'll grow to weigh nearly 275lbs.
How to Run From a Grizzly (Video)
Marlin Perkins and Stan Brock, from Mutual of Omaha's Wild Kingdom, have their hands full when they rope a grizzly, especially after the bear gets loose! Neither the bear nor the hosts were harmed in this film.
Surviving a Bear Attack (Video)
Survival Expert, Les Stroud, shows us how to survive around predators such as Mountain Lions and Bears.
Big cats like lions, tigers, leopards, jaguars and cheetahs all have the distinguishing characteristic of being able to roar. Read our articles and watch videos and slideshow galleries of big cats.
Image Gallery: Big Cats
View amazing photos of different types of big cats with this image gallery.
Image Gallery: Tigers
View amazing photos of different types of tigers with this image gallery.
Is there such a thing as a man-eating lion?
The king of the jungle has been known to salivate at the sight of a tasty human. But are these stories of lions wreaking havoc on people in Africa true?
What makes a cheetah run so fast?
Any animal that can go from zero to 40 mph in three strides must have a very specialized body. Why can cheetahs run so fast, and how does their ability make them vulnerable?
A Bobcat is a member of the cat family found in North America from southern Canada to central Mexico.
A Caracal is a type of lynx native to Africa and the warmer parts of Asia.
Cats are meat-eating animals that may be domesticated or wild.
The Cheetah is now found in the wild only in isolated areas of the Middle East and regions close by to the north and south.
Cougars are large cats found in various parts of North and South America.
The Genet is a small mammal native to Africa and is closely related to the mongoose.
The Jaguar is the largest cat of the Western Hemisphere.
The Leopard is a meat-eating animal of Africa, Asia, and the East Indies.
The Lion is a large meat-eating animal of Africa and India.
The Lynx is a member of the cat family found in temperate and colder areas.
Panther is a name applied to certain members of the cat family.
Tiger is the largest member of the cat family.
A Wildcat is any of the many kinds of small, undomesticated cats.
Do the maneless lions of Tsavo deserve their reputation for agressiveness towards humans? Watch this video to learn more about these unique and dangerous animals.
Lion Dads (Video)
Lion dads lead a pretty good life. Their primary job is to mate with multiple female lions, sit around and look good, and let all the lionesses do the hunting and hard work. Their time, however, is limited.
From the archives of Discovery: Tigers are some of the largest and most dangerous animals on the planet. Learn more about tigers in this video from Discovery.
The widely-dispersed cougar is the perfect hunter, having superb speed, agility, hearing, and strength. See the cougar's amazing attributes in this video from Animal Planet.
Florida Panther Preservation (Video)
Watch this video courtesy of Duke University showing a successful program that saved the Florida Panther in the southeast. To prevent further in-breeding, researchers brought in other panthers from Texas to mate with the panthers in the southeast.
Leopards & Lions (Video)
From the archives of Discovery: A leopard has a near-fatal encounter with a lioness. Learn more about leopards and lions in this video.
Marsupials are mammals that commonly bear a pouch such as Kangaroos and Koala Bears. Two thirds of marsupial species are found in Australia.
Do Koalas smell like cough drops?
If you can get past a koala's pungent scent of urine and mating-musk, you might detect a faint hint of cough drops. Why do koalas smell like they'd clear out your sinuses?
What's the difference between a wallaby and a kangaroo?
If you want to determine whether you've got your hands on a wallaby or a kangaroo, you're going to have to pry open the animal's mouth and examine its molars.
Why do kangaroos hop?
Million-dollar endorsement deals or a sneaker named the Air Roo aren't in the cards for kangaroos. Since these animals can't play in any Final Four championships, why do they hop?
A Kangaroo is a mammal native to Australia and nearby islands.
The Koala is an Australian marsupial that lives in trees.
The Tasmanian Devil is a flesh-eating animal found in Tasmania.
The Wombat is a mammal of Australia and is also a marsupial.
Pygmy Opossum (Video)
Watch this Reuters video showing a new animal - a Cercartetus pygmy opossum - that scientists found on a recent trip to the Foja Mountains of Indonesia, dubbed the Lost World. The opossum is one of the world's smallest marsupials.
Scenic Outback (Video)
From the archives of Discovery: The Australian outback is filled with diverse and unique forms of life, such as the kangaroo. Learn more about the outback.
Bats are the only flying mammal. Learn about these peculiar and misunderstood animals in this section.
Hoofed animals are generally herbivorious and very diverse. Learn about antelopes, cattle, deer, pigs and sheep. See the full list.
Insectivores are carnivorous mammals that survive by eating almost nothing but small insects. Insectivores include bats, frogs, lizards and anteaters.
Nearly 40% of mammal species are rodents, and they are found on every continent except Antarctica. Rodents include mice, rats, squirrels, chipmunks and beavers, among others.