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Mammals

Mammals are warm-blooded vertebrates that nurse their young with milk and, in almost every case, grow hair or fur. They range from the 30-gram bumblebee bat to the 150-tonne blue whale and live on every continent and ocean on Earth.

46 guides in this group

Mammals NT American Bison Bison bison The American bison is North America's largest land animal and its greatest conservation comeback — from tens of millions to a few hundred, and back. Learn how it shapes the prairie. Read the guide →
Mammals LC Arctic Fox Vulpes lagopus The Arctic fox has the warmest fur of any mammal, changes colour with the seasons, and can raise a litter of 18 in a lemming boom. Learn how it survives −50 °C and follows polar bears for scraps. Read the guide →
Mammals LC Capybara Hydrochoerus hydrochaeris The capybara is the world's largest rodent — a 50-kilogram, semi-aquatic grazer famous for its calm tolerance of almost every other animal. Learn how it lives in the wetlands of South America. Read the guide →
Mammals LC Cougar Puma concolor The cougar goes by more names than any other animal and roams from the Yukon to Patagonia. Learn why it isn't a "big cat", how far it can leap, and why it screams instead of roars. Read the guide →
Mammals LC Coyote Canis latrans The coyote has expanded across North America and into its cities faster than any other large predator, thriving under intense hunting pressure. Learn how it adapts, hunts, and outlasts persecution. Read the guide →
Mammals LC Echidna Tachyglossus aculeatus The echidna is a spine-covered, egg-laying mammal that has no teeth, senses prey by electric field, and can lower its body temperature almost to freezing. Learn how this ancient oddity survives. Read the guide →
Mammals LC Honey Badger Mellivora capensis The honey badger has loose armour-like skin, partial resistance to snake venom, and a documented talent for escaping any enclosure. Learn why it takes on cobras, lions, and beehives. Read the guide →
Mammals VU Koala Phascolarctos cinereus The koala is a marsupial — not a bear — that eats only toxic eucalyptus leaves and sleeps up to 22 hours a day. Learn how it survives that diet and why it's now Endangered in eastern Australia. Read the guide →
Mammals LC Leopard Seal Hydrurga leptonyx The leopard seal is Antarctica's top seal predator — a huge, reptilian-headed hunter that kills penguins and other seals but also filters krill through its teeth. Learn how this loner lives. Read the guide →
Mammals LC Meerkat Suricata suricatta The meerkat lives in tight cooperative gangs where members take turns standing guard, babysitting, and teaching pups to handle scorpions. Learn how a meerkat mob works and survives the Kalahari. Read the guide →
Mammals LC Moose Alces alces The moose is the largest deer on Earth, tall enough to wade chest-deep and dive for water plants. Learn about its two-metre antlers and why warming winters are killing it with ticks. Read the guide →
Mammals LC North American Beaver Castor canadensis The North American beaver is the continent's largest rodent and its most powerful ecosystem engineer, felling trees and damming streams to build the ponds it lives in. Learn how it works. Read the guide →
Mammals NT Plains Zebra Equus quagga The plains zebra is the most common wild horse, famous for stripes no two animals share. Learn what the stripes are actually for, why zebras were never tamed, and how their herds work. Read the guide →
Mammals NT Platypus Ornithorhynchus anatinus The platypus is a venomous, egg-laying mammal that hunts with its eyes shut, sensing prey by electric field. Learn how this Australian oddity works and why it is now Near Threatened. Read the guide →
Mammals LC Pronghorn Antilocapra americana The pronghorn is the fastest land animal in the Americas and Earth's best distance runner — built to escape a predator that went extinct 12,000 years ago. Learn about its speed and odd horns. Read the guide →
Mammals EN Red Panda Ailurus fulgens The red panda is not a panda and not a raccoon — it is the sole survivor of its own family, a cat-sized bamboo eater with a false thumb. Learn how it lives in the Himalaya and why it is Endangered. Read the guide →
Mammals EN Sea Otter Enhydra lutris The sea otter has no blubber and survives the cold Pacific on the densest fur of any animal, using rocks to crack shellfish. Learn how it keeps kelp forests alive — and why it is Endangered. Read the guide →
Mammals VU Sloth Bear Melursus ursinus The sloth bear is a shaggy, termite-slurping bear of the Indian subcontinent that carries its cubs on its back — and is responsible for more human maulings than any other bear. Learn how and why. Read the guide →
Mammals VU Snow Leopard Panthera uncia The snow leopard is the elusive big cat of Asia's highest mountains, with a metre-long tail for balance and warmth. Learn how it survives thin cold air — and why it can't roar. Read the guide →
Mammals VU Sun Bear Helarctos malayanus The sun bear is the smallest bear on Earth, with a 25-centimetre tongue for raiding beehives and a chest patch shaped like a rising sun. Learn how this tree-climbing forest bear lives. Read the guide →
Mammals EN Tasmanian Devil Sarcophilus harrisii The Tasmanian devil is the world's largest carnivorous marsupial — a bone-crushing scavenger fighting a contagious cancer that has killed most of the wild population. Learn how it's being saved. Read the guide →
Mammals VU Walrus Odobenus rosmarus The walrus uses its metre-long tusks to haul onto ice and its 700 whiskers to find clams on the dark seabed. Learn how this Arctic giant feeds, why it turns pink, and how ice loss threatens it. Read the guide →
Mammals LC Wild Boar Sus scrofa The wild boar is the ancestor of the domestic pig, one of the most widespread mammals on Earth, and — as feral hogs — one of the most destructive invasive animals. Learn how it lives and spreads. Read the guide →
Mammals LC Wolverine Gulo gulo The wolverine is a 15-kilogram member of the weasel family that drives bears off carcasses and hunts prey in deep snow. Learn how it survives the far north and why warm winters threaten it. Read the guide →
Mammals LC Wombat Vombatus ursinus The wombat is a burrowing Australian marsupial with a backward-facing pouch, a bum made of armour, and — uniquely in the animal kingdom — cube-shaped droppings. Learn how and why. Read the guide →
Mammals EN African Elephant Loxodonta africana The African elephant is the largest land animal alive, with a 40,000-muscle trunk and a 22-month pregnancy. Learn how herds are led by matriarchs and why ivory poaching still threatens them. Read the guide →
Mammals EN Blue Whale Balaenoptera musculus The blue whale is the largest animal that has ever lived — bigger than any dinosaur — yet it eats some of the ocean's smallest creatures. Learn how it feeds, communicates, and is recovering. Read the guide →
Mammals LC Bottlenose Dolphin Tursiops truncatus The bottlenose dolphin hunts with sound, calls other dolphins by name, and uses tools. Learn how echolocation works, why pods cooperate, and what threatens this widespread ocean mammal. Read the guide →
Mammals LC Brown Bear Ursus arctos The brown bear is the most widespread bear on Earth, from Spain to Alaska, and includes the grizzly and the giant Kodiak. Learn how it hibernates, what it eats, and how a cub is born mid-sleep. Read the guide →
Mammals EN Chimpanzee Pan troglodytes The chimpanzee is one of our two closest living relatives, sharing about 98.8% of our DNA. Learn how chimp societies work, how they use tools and hunt, and why they're Endangered. Read the guide →
Mammals VU Giraffe Giraffa camelopardalis The giraffe is the tallest animal on Earth, with a heart built to pump blood two metres straight up. Learn how its neck, tongue, and blood pressure work — and why it faces a "silent extinction". Read the guide →
Mammals LC Gray Wolf Canis lupus The gray wolf is a cooperative pack hunter and the wild ancestor of every domestic dog. Learn how packs work, why wolves howl, and how they reshape whole ecosystems. Read the guide →
Mammals VU Hippopotamus Hippopotamus amphibius The hippopotamus spends its days in water and its nights grazing on land, sweats a red antibiotic sunscreen, and is one of Africa's most dangerous animals. Learn how this river giant lives. Read the guide →
Mammals NT Jaguar Panthera onca The jaguar is the biggest cat in the Americas and has the strongest bite of any big cat for its size — it kills by piercing the skull. Learn how it hunts in water and why it's Near Threatened. Read the guide →
Mammals VU Leopard Panthera pardus The leopard is the most adaptable big cat — a solitary, night-hunting climber that hauls its kills into trees. Learn how it survives almost anywhere and why it's still Vulnerable. Read the guide →
Mammals DD Orca Orcinus orca The orca is the ocean's top predator — a giant dolphin that hunts in coordinated family pods and even kills great white sharks. Learn how orca culture works and why some populations are collapsing. Read the guide →
Mammals VU Polar Bear Ursus maritimus The polar bear is the largest land carnivore and a marine mammal that hunts seals from sea ice. Learn how it stays warm, why it needs the ice, and how warming threatens it. Read the guide →
Mammals LC Red Fox Vulpes vulpes The red fox is the most widespread wild carnivore on Earth, at home in forests, deserts, and city centres alike. Learn how it hunts by the Earth's magnetic field and why it thrives around people. Read the guide →
Mammals LC Red Kangaroo Osphranter rufus The red kangaroo is the largest marsupial alive, built to bounce across Australia's dry interior. Learn how hopping saves energy, how the pouch works, and why females can pause a pregnancy. Read the guide →
Mammals LC Sloth Bradypus variegatus The sloth is the slowest mammal on Earth, moving and digesting so slowly that algae grows in its fur. Learn why it only comes down from the canopy once a week — and why that trip is so dangerous. Read the guide →
Mammals EN Tiger Panthera tigris The tiger is the largest cat on Earth and a solitary ambush hunter. Learn how it stalks prey, why every tiger's stripes are unique, and why fewer than 5,600 remain wild. Read the guide →
Mammals CR Western Gorilla Gorilla gorilla The western gorilla is the largest primate and shares about 98% of its DNA with humans. Learn how silverback-led troops live, what gorillas eat, and why the species is Critically Endangered. Read the guide →
Mammals NT White Rhinoceros Ceratotherium simum The white rhino is the second-largest land animal and a conservation rollercoaster — saved from under 100 animals a century ago, then hammered by a poaching crisis for its horn. Read the guide →
Mammals VU Cheetah Acinonyx jubatus The cheetah is the fastest land animal, built entirely for the sprint. Learn how it hits 100 km/h, why the chase costs so much, and why only about 6,500 remain in the wild. Read the guide →
Mammals VU Giant Panda Ailuropoda melanoleuca The giant panda is a bear that eats almost nothing but bamboo. Learn how it survives on a low-energy diet, why cubs are so tiny, and how it went from Endangered to Vulnerable. Read the guide →
Mammals VU Lion Panthera leo The lion is the only big cat that lives in social groups. Learn how prides hunt, how cubs are raised, and why lion numbers have fallen by roughly half since 1990. Read the guide →