Penguins are flightless seabirds that have adapted superbly to life in cold water. They are well known and loved, yet some popular ideas about them are not quite right.
Key takeaways
- All penguin species live in the Southern Hemisphere.
- Penguins cannot fly, but they swim using wing-like flippers.
- Emperor penguins breed in the Antarctic winter, and the males incubate the eggs.
- Not all penguins live on ice, since some live in temperate regions and one species lives near the equator.
- Penguins and polar bears never meet in the wild.
Southern birds
Penguins live only in the Southern Hemisphere, in places such as Antarctica, South America, southern Africa, Australia and New Zealand. Experts typically count about 18 species. The Galápagos penguin lives on islands near the equator, kept cool by ocean currents. Many species live on temperate coasts, not in snow and ice.
Built for swimming
Penguin wings have become stiff, flat flippers that propel the birds through water in a motion that resembles flying underwater. Their bodies are streamlined, and their feet and tail help steer. Emperor penguins can dive to depths of several hundred metres and stay under for around 20 minutes. Dense, waterproof feathers, a layer of fat and tightly packed plumage insulate them. Their dark backs and white bellies provide camouflage from above and below, a pattern known as countershading.
Size range
The emperor penguin is the largest, standing about 1.1 metres tall and weighing around 20 to 40 kilograms. The little penguin, found around Australia and New Zealand, is the smallest at about 30 centimetres tall.
Emperor penguins in winter
Emperor penguins breed during the Antarctic winter. After the female lays a single egg and transfers it to the male, she goes to sea to feed. The male keeps the egg warm on his feet under a fold of skin, often for about two months, in temperatures that may fall far below freezing and with fierce winds. Males huddle together in large groups, taking turns moving from the cold edges to the warmer middle. When the females return with food, the parents share the work of feeding the chick.
Diet and hunting
Penguins eat fish, krill and squid, depending on species and location. They hunt in groups or alone. Predators include leopard seals, orcas and sharks in the sea, and skuas and other birds that take eggs and chicks on land.
Do they have knees?
Penguins have knees, but they are hidden inside their body feathers, and the lower leg looks like the whole leg. This gives them a waddling walk. On snow, many species also slide on their bellies, which is called tobogganing and saves energy.
Threats
Climate change, changes in food supply, fishing, pollution and oil spills threaten some penguin populations. Scientists monitor colonies using satellite images, since breeding sites can be hard to reach, and several species are listed as threatened.
A tour of the species
The usual count is around eighteen species, from tiny to tall. Emperor penguins are the largest and breed on Antarctic sea ice, and king penguins, the second largest, nest on sub-Antarctic islands. Adelie, chinstrap and gentoo penguins live around Antarctica and nearby islands, and the chinstrap is named for the thin black line under its head. In temperate regions live the African penguin, Humboldt penguin off Peru and Chile, Magellanic penguin in South America and the little penguin of Australia and New Zealand. Rockhoppers and macaroni penguins have bright yellow crests. The Galapagos penguin is the only species that regularly crosses the equator.
Colonies and parenting
Penguin colonies can contain hundreds of thousands of birds. Adelie penguins build nests of small stones, and males sometimes steal stones from neighbours. King penguins and emperor penguins build no nest and balance a single egg on their feet. Parents take turns incubating and feeding. When chicks grow, many species gather in groups called creches while both parents hunt. Colonies are noisy, and each bird recognises its mate and chick by its call, which helps them find each other in huge crowds.
Swimming and diving
Penguins are strong swimmers. Most cruise at about six to ten kilometres an hour, and gentoo penguins can reach roughly thirty-five kilometres an hour in bursts. Their solid bones help them dive, unlike the hollow bones of flying birds, and some, such as emperors, can dive to more than five hundred metres. A thin layer of air trapped in their feathers helps with insulation, and releasing tiny air bubbles as they swim may reduce drag. Penguins return to land or ice to rest, moult and breed.
Threats and conservation
Many penguin species face pressure. In some Antarctic regions, the loss of sea ice has been linked to breeding failures of emperor penguins, whose chicks can drown or die of cold if the ice breaks up before they have grown waterproof feathers, and scientists have raised concern about the future of the species. African penguins have declined steeply, with threats including lack of fish, oil pollution and habitat loss. Other pressures include fishing, which competes for food, and disturbance by people. Conservation actions include protecting marine areas, creating artificial nests and cleaning oiled birds.
Penguins and people
Penguins are popular in films, books and zoos, and tourism to see colonies in places such as the Falkland Islands, South Africa and Antarctica brings income. Visitors are asked to keep a distance, avoid walking through colonies and follow local guidelines to avoid stressing the birds. Scientists use cameras, satellite images and counts of droppings visible from space to monitor colonies in places that are hard to reach.
Frequently asked questions
Do penguins live at the North Pole?
No. The Arctic has no penguins. Polar bears live in the Arctic and penguins in the south.
Why don't penguins' feet freeze?
Special blood vessel arrangements help retain heat, and they limit time standing on very cold surfaces by using their heels and tails.
Can penguins fly?
Not in the air, but they are expert swimmers.
How do penguins stay warm in freezing conditions?
They have several adaptations: dense waterproof feathers, a layer of fat, a compact body shape and blood vessels arranged to reduce heat loss from the feet and flippers. Emperor penguins also huddle together to share warmth.
Why do penguins huddle?
Huddling reduces heat loss in extreme cold and wind. Birds rotate positions slowly, so those on the cold edge move into the warmer middle over time. Huddles can reach temperatures that feel balmy compared with the air outside.
Do penguins mate for life?
Not always. Many species reunite with the same partner for several seasons, which helps them breed successfully, but they do not necessarily pair for life, and some change partners if a pair fails to breed.
Sources and further reading
Written by
FactNest Editorial Team
FactNest is operated by Muonix. The FactNest Editorial Team publishes general-interest explainers with AI-assisted drafting and illustrations. Contact contact@muonix.co for questions or corrections; we respond within 2 business days.
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