Great Auk vs Penguin for Kids
Great auks and penguins are a textbook case of convergent evolution. Both became upright black-and-white seabirds with wings turned into underwater propellers, yet they came from different families on opposite sides of the world. Pinguinus impennis was a North Atlantic alcid related most closely to the razorbill. Penguins are the living Southern Hemisphere order Sphenisciformes. This page compares the one great-auk species with the penguin group, using the emperor penguin only when a named largest-species or deepest-dive benchmark is needed.
Great Auk
- Type: Extinct Bird
- Group: Extinct flightless North Atlantic alcid species, Pinguinus impennis, in family Alcidae; closest living relative is the razorbill
- Known for: Large black-and-white body, white eye patch in breeding plumage, deep grooved bill, tiny flightless wings, wing-propelled diving, one egg, rocky colonies, and hunting-driven extinction
- Diet: Carnivore and marine feeder; ate fish and likely other sea prey, though exact diet and dive performance are incompletely reconstructed
- Special skill: Using short stiff wings as underwater paddles to pursue prey across the North Atlantic despite being completely unable to fly in air
Penguin
- Type: Bird Group
- Group: Living flightless seabirds in order Sphenisciformes; species vary greatly, with emperor penguin Aptenodytes forsteri used only for the largest-size and deepest-dive benchmarks
- Known for: Southern Hemisphere range, streamlined bodies, stiff flippers, dense bones, waterproof feathers, webbed feet, colonies, underwater agility, and species-specific cold or coastal adaptations
- Diet: Carnivore; catches fish, krill, squid, and other marine animals, with diet varying by penguin species and season
- Special skill: Flying through water with stiff flippers; the emperor benchmark has recorded dives to 565 metres and 22 minutes
Quick Answer
Quick answer: The great auk was not a penguin. It was a roughly 70-centimetre, 5-kilogram flightless alcid from the North Atlantic, while living penguins are Southern Hemisphere birds ranging from small rockhoppers to the emperor, which can reach about 40 kilograms at peak seasonal mass. Both used stiff wings to fly through water and bred in colonies, but no scientist measured the great auk’s speed or dive depth. Their similar shapes evolved independently for the same underwater job.
Great Auk vs Penguin: Quick Comparison
| Feature | Great Auk | Penguin |
|---|---|---|
| Status | Extinct in the 1800s | Living group with multiple species |
| Scientific scope | Pinguinus impennis | Order Sphenisciformes; emperor used only for named benchmarks |
| Closest relatives | Razorbill and other alcids such as murres and puffins | Other penguins within their own seabird order |
| Hemisphere | North Atlantic | Southern Hemisphere, with Galapagos penguins reaching the equator |
| Body size | About 70 cm tall and roughly 5 kg | Varies widely; some smaller than a great auk, emperor up to about 40 kg seasonally |
| Wings | Very short flightless auk wings used in diving | Short stiff flippers used in diving |
| Bill | Deep laterally flattened black bill with pale grooves | Shape varies from short and thick to long and slender by species and diet |
| Breeding | Dense rocky colonies, one large egg, pair care inferred from evidence | Colonies and pair care common, but nests, egg number, and roles vary by species |
| Dive evidence | Powerful swimmer, but no reliable instrument record of depth, time, or speed | Direct tracking; emperor benchmark reached 565 m and 22 minutes |
| Main evidence | Skins, skeletons, eggs, archaeology, historical accounts, and ancient DNA | Living observation, cameras, tags, physiology, anatomy, and genetics |
How Were Great Auks and Penguins Alike?
- Both were or are flightless seabirds with streamlined bodies and short wings specialised for underwater propulsion.
- Both had or have dark backs and pale undersides that create countershading in the ocean.
- Both used or use webbed feet for steering in water and for moving on land.
- Both bred or breed in colonies and invested heavily in eggs and chick care.
- Both fed or feed on marine animals and returned to land mainly for breeding, resting, or moulting.
How Were Great Auks and Penguins Different?
- The great auk was an alcid related to razorbills, while penguins form the separate order Sphenisciformes.
- The great auk lived in the North Atlantic, while living penguins occur mainly across the Southern Hemisphere.
- The great auk had a deep grooved auk bill, while penguin bills vary widely with species and prey.
- The great auk was one species of about 5 kilograms, while living penguins range from smaller species to emperor penguins several times heavier.
- Great-auk performance and behaviour survive mainly through specimens and old accounts, while penguin diving, huddling, calls, parenting, and movement can be measured directly.
Great Auk vs Penguin Showdown
Adaptation showdown: Size is tied because penguin is a broad group: some living penguins are smaller than the roughly 5-kilogram great auk, while the emperor benchmark can be many times heavier. Speed is tied because penguin swimming is timed but no equivalent great-auk measurement exists. Strength is tied because both supported different bodies and propelled themselves underwater, yet no matched force test can be made. Stealth is tied because both used countershading, while great-auk concealment behaviour and penguin habitats vary. Social behaviour is tied because both bred colonially with pair care, but the great auk’s details are incomplete and penguin systems differ by species. Swimming is tied because both were wing-propelled specialists, but only living penguins carry instruments that measure performance. Great Auk wins weirdest because an alcid independently evolved the upright, flightless, underwater-flying form now associated with an unrelated Southern Hemisphere bird group.
Fun Great Auk vs Penguin Facts
The Closest Living Relative Has a Razor Bill
Mitochondrial DNA placed the great auk inside the Atlantic alcid branch and supported the flying razorbill as its closest living relative. Puffins, murres, and auklets are also alcids; no penguin belongs to that family.
Its Tiny Wings Were Underwater Engines
Great-auk wings were too reduced for air flight but stiff enough to push against dense water. Historical observers and skeletal anatomy show excellent swimming, yet popular exact depth, breath-hold, and speed numbers are estimates from living relatives rather than instrument readings from a great auk.
One Egg Made Every Breeding Season Costly
Great auks gathered on rare low rocky islands that flightless adults could reach from the sea. Each female laid one large egg on bare ground, and brood patches on both sexes support shared incubation, making egg collecting especially damaging.
Ancient DNA Found No Slow Genetic Fade
Researchers sequenced mitochondrial genomes from 41 great auks across their former range. They found high diversity and no clear decline before intensive hunting; population models showed that realistic human harvest pressure alone could have caused a rapid extinction.
The Emperor Is a Benchmark, Not Every Penguin
The largest living penguin can weigh up to about 40 kilograms at the start of breeding. Tracked emperors have reached 565 metres and 22 minutes on exceptional dives, but these records must not be copied onto every penguin species.
Great Auk vs Penguin Quiz
- Was the great auk a true penguin? Answer: No, it was an alcid.
- What is the great auk’s closest living relative? Answer: The razorbill.
- Where did great auks live? Answer: Around the North Atlantic.
- How many eggs did a female great auk usually lay in a breeding attempt? Answer: One large egg.
- Why is swimming speed a tie? Answer: Penguin performance is measured, but no comparable great-auk instrument record exists.
Great Auk vs Penguin FAQ
Was the great auk a penguin?
No. It was a member of Alcidae, the Northern Hemisphere family containing razorbills, puffins, and murres. Penguins belong to Sphenisciformes.
Which was bigger, a great auk or a penguin?
It depends on the penguin species. A great auk weighed about 5 kilograms, more than some small penguins but far less than an emperor penguin at peak seasonal mass.
Could great auks and penguins fly?
Neither could perform powered flight in air. Both independently changed their wings into stiff underwater propellers.
Could a great auk dive as deep as an emperor penguin?
Scientists do not know. Great auks were strong divers, but no reliable instrument measured their depth; the emperor record cannot be copied onto them.
Did great auks and penguins ever meet naturally?
No natural meeting is known. Great auks occupied the North Atlantic, while living penguins evolved and live mainly in the Southern Hemisphere.
Animal Words to Know
- Alcid: A member of the Northern Hemisphere seabird family containing auks, puffins, murres, and auklets.
- Sphenisciform: A member of the bird order containing all living and extinct true penguins.
- Convergent evolution: The independent evolution of similar features in unrelated groups facing similar jobs or environments.
- Countershading: Dark colouring above and pale colouring below that can reduce visibility in water.
- Colony: A place where many animals of the same species gather to breed or rest.
Map Two Underwater Flight Experiments
Map Two Underwater Flight Experiments
Draw a North Atlantic panel with one 70-centimetre great auk, deep grooved bill, tiny stiff wings, webbed feet, one egg, low rocky island, razorbill family branch, and an unnumbered dive path marked unknown. Draw a Southern Hemisphere panel with three penguin silhouettes of different sizes, including a labelled-in-your-notebook emperor benchmark, stiff flippers, webbed feet, colony, sea ice, and a recorder tag icon. Connect matching wing, foot, and countershading cards to convergent evolution, then sort every claim into historical evidence, ancient DNA, living measurement, or unknown.
Meet Each Animal
Want the full fact file? Here are quick highlights from each animal’s own facts page.
Great Auk Fact Highlight
From the full animal facts pagePenguin Fact Highlight
From the full animal facts pageMore Animal Comparisons
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