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July 26, 2026Sources cited
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Penguin

Penguins are a group of flightless marine birds in the order Sphenisciformes that live only in the Southern Hemisphere.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Penguins are a group of flightless marine birds in the order Sphenisciformes that live only in the Southern Hemisphere. There are about 18–21 species, ranging from Antarctic birds to the Galápagos penguin near the Equator. They are adapted for swimming, with flippers and a streamlined body.

Classification

Penguins belong to the order Sphenisciformes and the family Spheniscidae. Modern sources commonly describe them as a group of 18–21 species of flightless marine birds.

Distribution and habitat

Penguins occur only in the Southern Hemisphere. While many are associated with Antarctica, most species live and breed on islands in temperate waters between about 45° and 60° south latitude.

Adaptations

Penguins are specialized for swimming rather than flight, with flipper-like wings, streamlined bodies, and plumage that helps with camouflage in water. They are aquatic birds that spend substantial time at sea.

Diet and behaviour

Penguins primarily eat marine animals such as krill, fish, and squid. They catch prey while swimming and are known for returning to land or ice to breed.

Key facts

  • Penguins are flightless birds adapted for life in the ocean.
  • They live only in the Southern Hemisphere.
  • Most species breed on islands between about 45° and 60° south latitude.
  • The Galápagos penguin is the only species found at the Equator.
  • Penguins have flippers for swimming and countershaded plumage.
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Canadian context

Penguins are popular in Canadian zoos, aquariums, and wildlife education, but they are not native to Canada.

Frequently asked questions

How many penguin species are there?
Sources commonly give a range of about 18–21 species.
Do penguins live in Antarctica only?
No. Many live in colder southern regions, but most species are found outside Antarctica on islands in the Southern Hemisphere.
Can penguins fly?
No. Penguins are flightless birds, but their wings are adapted into flippers for swimming.
What do penguins eat?
They mainly eat marine prey such as krill, fish, and squid.
Where is the Galápagos penguin found?
It is found near the Equator, making it the only penguin species living in the Northern Hemisphere region closest to the Equator.

References

  1. Encyclopaedia Britannica — https://www.britannica.com/animal/penguin
    Supports: Species count, Southern Hemisphere distribution, latitude range, and general description of penguins.
  2. Merriam-Webster — https://www.merriam-webster.com/dictionary/penguin
    Supports: Definition of penguin as a flightless aquatic bird of the Southern Hemisphere.
  3. Wikipedia — https://en.wikipedia.org/wiki/Penguin
    Supports: Common adaptations, diet, size comparisons, and general biological overview; used cautiously as a secondary reference.