Penguin Facts & Trivia: Dives, Huddles and Satellites

• Eighteen species is a convention, not a settled count. The defensible range runs from 16 to 22, depending on unresolved calls about where the species line falls between closely related birds. Of the conventional 18, five live in Antarctica and another four on sub-Antarctic islands.
• The longest dive recorded for any bird belongs to an emperor penguin tagged in the Ross Sea: 32.2 minutes underwater.
• A huddle reaches +24°C inside, with birds packed at up to 10 per square metre.
• The male incubates alone for 65 to 75 days and has fasted for four months by the time the chick appears, losing close to half his body mass.
• Nesting chinstraps sleep in 600 microsleeps an hour — over 10,000 a day, most lasting seconds — and still bank 11.5 to 12 hours of slow-wave sleep per brain hemisphere daily.
• The first census of any species conducted entirely from space counted penguins: about 238,000 emperor breeding pairs at 46 colonies, roughly 595,000 adults.
• Colonies are found from orbit by their guano stains. Of the 62 emperor colonies known in 2023, exactly half were discovered by satellite.
• A previously unknown Adélie supercolony in the Danger Islands holds 751,527 breeding pairs — more than 1.5 million birds — first spotted as guano in NASA imagery.
• On 28 October 2024 the African penguin became the first penguin ever listed Critically Endangered. It has already lost 97% of its population.
• The largest king penguin colony collapsed by 88%. Île aux Cochons in the Crozet Islands fell from about 500,000 pairs to 60,000 in 35 years.
• New Zealand's hoiho is down to 143 known nests on the mainland and Rakiura/Stewart Island, an 80% fall since the 2008/09 season.
• The little penguin weighs just under a kilogram, spends about 80% of its life at sea, and has been recorded diving to 72 m.
• In January 2024 film-makers at Atka Bay recorded emperor chicks leaping from an ice cliff roughly 50 feet above the sea for their first swim. It was widely reported as a climate-change consequence; the scientists involved do not think that is established.
• Breeding Adélies may eat as much as 1,500,000 tonnes of krill a year, gripping slippery prey with a spiny tongue.
• Emperors breed on sea ice rather than solid ground, and may be the only birds that never set foot on land. Researchers keep the hedge, because breeding is almost — not entirely — exclusive to the ice.

"Emperor penguins have the densest feathers of any bird." Nobody had counted. When Cassondra Williams' team at UC Irvine actually measured emperor plumage, the maximum was nine feathers per square centimetre — and a small Eurasian river bird, the white-throated dipper, turned out to be about six times denser. The widely quoted figures of 11–46 feathers per cm² had been published with no stated method behind them.

"Penguins mate for life." Divorce is routine and measurable. Across more than a decade of monitoring little penguins at Phillip Island, the annual divorce rate averaged 0.26 — about a quarter of pairs splitting each year, and more than a third in the worst season.

"Penguins topple over backwards watching aircraft." The story began with British servicemen during the 1982 Falklands War. Richard Stone of the British Antarctic Survey went to South Georgia and filmed king penguin colonies for five weeks while Royal Navy Lynx helicopters passed overhead. Not one bird fell over across 17 flights. The study did find something real, though: low-flying aircraft cause the birds considerable distress.

"They lost flight because they got too heavy." It is a trade-off between two fluids, not sheer mass. Researchers measured thick-billed murres — wing-propelled divers that still fly — and found their flight cost among the highest ever recorded for a bird, while their diving costs sat between a penguin's and a duck's. A wing good at water is a bad wing for air, and at some point the air side is not worth paying for.

March of the Penguins (2005) became one of the highest-grossing documentaries ever made and won the Academy Award for Best Documentary Feature. Happy Feet (2006) took the Oscar for Best Animated Feature the same decade. Madagascar (2005) produced four penguins so popular they were spun into their own film in 2014. Further back, Batman's Penguin has been a fixture since 1941, played memorably by Burgess Meredith, Danny DeVito and Colin Farrell. Pittsburgh has fielded a National Hockey League team called the Penguins since 1967, and Linux has shipped with a penguin named Tux as its mascot since 1996.

Nils Olav, a king penguin resident at Edinburgh Zoo, holds a commission in the Norwegian King's Guard: first adopted as a mascot in 1972, promoted repeatedly over the decades, and knighted in 2008 with the approval of King Harald V. The title passes down a line of successors, so the current holder is Nils Olav III.

Pierre, a Magellanic penguin at the California Academy of Sciences, made news in 2007 when a biologist had a neoprene wetsuit made for him after he lost his feathers and could no longer stay warm in the water. Tux, though a drawing rather than a bird, is arguably the most reproduced penguin in history.