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Penguin

This article is about penguin birds. For other meanings, see Penguin (disambiguation).

Aptenodytes
Eudyptes
Eudyptula
Megadyptes
Pygoscelis
Spheniscus Penguins (order Sphenisciformes, family Spheniscidae) are an order of flightless birds living in the southern hemisphere. They are not, contrary to popular belief, only found in cold climates, such as Antarctica. Three species live in the tropics; one lives as far north as the Galapagos Islands and will occasionally cross the equator while feeding.

Penguins like to stay and move within large groups. Most penguins live off krill, fish, squid, and other forms of sealife that they catch while swimming underwater. They spend half of their life time on land and half in the oceans.

The largest species is the Emperor Penguin (Aptenodytes forsteri): adults average about 1.1 meters (3-4 feet) tall and weigh 30 or more kilograms (75 lb). The smallest penguin species is the Little Blue Penguin (also known as the Fairy Penguin), which is typically 35 to 40 cm tall (14-16 in.) and 1 kilogram (2.5 lb). Generally larger penguins retain heat better and thus inhabit colder regions, while smaller penguins are found in temperate or even tropical climates.

Penguins emerged in the Eocene era 40 million years ago. Birds like Palaeeudyptes from the Eocene, Pachydyptes from the Miocene and the now extinct Great Auks resembled modern penguins. The links between other bird orders and penguins are still unknown, and though a close relationship between penguins, Procellariiformes and Gaviiformess is usually assumed, it has not been proved and some anatomical evidence has been interpreted as supporting a placement of Spheniscidae within a group of birds classified as Pelecaniformes. Most fossil penguins known are large, but not larger than the modern Emperor Penguin. All lived in the southern hemisphere.

Several instances of homosexual behavior have been noted in zoo penguins (see: homosexuality in animals)[1]. There have also been several efforts to separate the homosexual pairings, sometimes by introducing more female penguins, but these attempts usually fail.



Contents

Anatomy

Penguins are superbly adapted to an aquatic life. Their wings have become flippers, useless for flight in the air. In the water, however, penguins are astonishingly agile. Within the smooth plumage a layer of air is preserved, ensuring buoyancy. The air layer also helps insulate the bird in the icy waters of the Antarctic. The plumage of penguins in tropical and temperate zones is much thinner.

On land, penguins use their tails and wings to maintain balance.

All penguins have a white underside and a dark (mostly black) upperside. This is for camouflage. A predator looking up from below (such as an orca or a leopard seal ) has difficulty distinguishing between a white penguin belly and the reflective water surface.

Diving penguins reach 6 to 12 km/h, though there are reports of velocities of 27 km/h (which are probably realistic in the case of startled flight). The small penguins do not usually dive deep; they catch their prey near the surface in dives that normally last only one or two minutes. Larger can dive deep in case of need. The Emperor Penguin has been recorded reaching a depth of 267 metres and staying submerged for 18 minutes.

On land, penguins are clumsy. They either waddle on their feet or slide on their belly across the snow. They slide on their stomachs, called "tobogganing", to conserve energy and move relatively fast at the same time.

Penguins have an excellent sense of hearing. Their eyes are adapted for underwater vision, and are their primary means of locating prey and avoiding predators; in air, conversely, they are nearsighted. Their sense of smell has not been researched so far.

Penguins have no external genitalia. Consequently, chromosome testing must be done in order to determine a penguin's sex.

Classification

 hunting for
Enlarge
Chinstrap Penguin hunting for krill


ORDER SPHENISCIFORMES

Name

Penguin is thought by some to derive from the Welsh words pen (head) and gwyn (white), applied to the Great Auk, which had a conspicuous white patch between the bill and the eye (although its head was black), or from an island off Newfoundland known as "White Head" due to a large white rock. According to another theory, the original name was pen-wing, with reference to the rudimentary wings of both Great Auks and penguins. A third theory is that penguin comes from the Latin pinguis (fat).

Penguins in popular culture

Penguins are popular around the world owing to their harmless nature, their upright stance for standing and walking, which humans find charming or comical, and their striking black and white plumage that is often humorously likened to a tuxedo suit.


Computing

  • Sega's 1982 video-game Pengo stars a penguin.
  • A penguin is a main character in a number of 1980s Konami games, and shows up as a mascot in others.
  • Penguins are featured in the computer game Pingus, similar to the classic computer game Lemmings.
  • The Linux mascot Tux is a penguin, and is featured in several computer games, such as Tux Racer.
  • The website http://www.thepenguinconspiracy.com/ is one of several sites that talk about "evil penguins."

Politics

Comics

Film

Sports mascots

Places

Penguin is a town in Tasmania Australia. Latitude: -41.11N, Longitude: 146.06E Map Quest

Audio CDs

  • Frobisher, the talking alien penguin from the DWM comics, has appeared in several of the licensed Doctor Who audio plays produced by Big Finish, including The Holy Terror and The Maltese Penguin .
  • Sack Trick's Second album, Penguins on the Moon, Is the tale of four heroic penguins, who journeyed to the moon in search of a more habitable climate.

External links

Last updated: 06-01-2005 22:53:04
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