Penguin

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Penguin
Gentoo penguin 1.jpg
Gentoo penguin
Pygoscelis papua
Scientific classification
Kingdom Information
Domain Eukaryota
Kingdom Animalia
Subkingdom Bilateria
Phylum Information
Superphylum Deuterostomia
Phylum Chordata
Sub-phylum Vertebrata
Infraphylum Gnathostomata
Class Information
Superclass Tetrapoda
Class Aves
Sub-class Neornithes
Infra-class Neognathae
Order Information
Order Spheniciformes
Family Information
Family Spheniscidae
Genus Information
Genera Aptenodytes
Eudyptes
Eudyptula
Megadyptes
Pygoscelis
Spheniscus
Population statistics

Penguins are 21 species of flightless birds inhabiting the cold waters of the Southern Hemisphere, the most highly-specialized of any aquatic bird.

Contents

Entymology

Penguins were discovered with the great explorations of the 16th century, as European sailors pushed southward into the Atlantic Ocean. The first species of penguin they may have encountered was the gentoo penguin (Pygoscelis papua), which inhabits Patagonia, the Falkland Islands and South Georgia. The similarity in shape, habits, and coloration to a bird they had already known as the penguin - the extinct great auk (Pinguinus impennis) - was striking, hence the transfer of the name. The word is possibly based upon the Welsh pen gwyn[1], referring to the white eye patch on the head of the auk; or upon pin-wing, in reference to both bird's rudimentary wings.

Description

Depending on the species, penguins are between 16 and 46 inches in length. The largest is the emperor penguin (Aptenodytes forsteri), which stands close to four feet tall and weighs in at nearly 90 pounds; the smallest is the little penguin (Eudyptula minor) at sixteen inches and two pounds. When standing, penguins have a fully-erect posture and tend to move about in a comically-awkward gait, or they "toboggan", i.e. they slide on their bellies when on the ice, using feet and wings to push themselves along.

The body is streamlined and tapered at both ends, with the feet acting as rudders. The wings are nearly-fused at the wrists and elbows, and the bones flattened, giving the wings a paddle-like shape. Despite being flightless, penguins still have a well-defined keel sternum and powerful wing muscles, enabling the birds to move about in the water effortlessly, cruising at ten knots, yet capable of bursts in excess of twenty knots.

Coloration is similar to not just the great auk, but to orcas and several species of shark, in that they are countershaded (dark above, white below); the pattern is a type of camouflage, making them disappear in the dark depths of the sea when viewed from above, or blend in with the light patterns of the surface when viewed from below[2].


Phylogeny

  • Family Spheniscidae
Subfamily Spheniscinae
Genus Aptenodytes
Emperor penguin, Aptenodytes forsteri
King penguin, Aptenodytes patagonicus
Genus Eudyptes
Chatham penguin, Eudyptes chathamensis (extinct)
Eastern rockhopper penguin, Eudyptes filholi
Erect-crested penguin, Eudyptes sclateri
Fiordland crested penguin, Eudyptes pachyrynchus
Macaroni penguin, Eudyptes chrysolophus
Northern rockhopper penguin, Eudyptes moseleyi
Royal penguin, Eudyptes schlegeli
Snares crested penguin, Eudyptes robustus
Western rockhopper penguin, Eudyptes chrysocome
Genus Eudyptula
Little penguin, Eudyptula minor
Genus Megadyptes
Waitaha penguin, Megadyptes waitaha (extinct)
Yellow-eyed penguin, Megadyptes antipodes
Genus Pygoscelis
Adelie penguin, Pygoscelis adeliae
Chinstrap penguin, Pygoscelis antarctica
Gentoo penguin, Pygoscelis papua
Genus Spheniscus
African penguin, Spheniscus demersus
Galapagos penguin, Spheniscus mendiculus
Humboldt penguin, Spheniscus humboldti
Magellanic penguin, Spheniscus magellanicus

References

  1. http://www.english-for-students.com/Penguin.html#chitika_close_button
  2. http://www.seaworld.org/animal-info/info-books/penguin/physical-characteristics.htm
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