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Oct 29, 2008 at 03:28 o\clock
Fashionable
Oct 20, 2008 at 05:18 o\clock
Basketball
Oct 20, 2008 at 05:16 o\clock
An Overview of the Olympics
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Fever Pitch
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Golf Swing
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How to Play Cricket
Sep 25, 2008 at 10:31 o\clock
Penguins' Behavior
A. Social behavior
1. Penguins are among the most social of all birds. All species are colonial to some degree (del Hoyo, et al.,cheap wow gold 1992). Penguins communicate by vocalizing and performing physical behaviors called "displays."
2. Penguins may swim and feed in groups, but some may be solitary when diving for food. Emperor penguins have been observed feeding in groups with coordinated diving (Marchant,Buy FFXI Gilbuy cheap wow gold 1990).
3. During the breeding season some species come ashore and nest in huge colonies called rookeries. Some rookeries include hundreds of thousands of penguins and cover hundreds of square kilometers (Marchant, 1990).
4. Penguins exhibit intricate courting and mate-recognition behavior. Elaborate visual and vocal displays help establish and maintain nesting territories (Marchant, 1990).
5. Although king penguins are highly gregarious at rookery sites throughout the year, they usually travel in small groups of 5 to 20 individuals (Marchant, 1990).
6. Penguins communicate by vocalizing and performing physical behaviors called "displays." They use many vocal and visual displays to communicate nesting territories and mating information. They also use displays in partner and chick recognition, and defense against intruders (Sparks and Soper,Warhammer Gold 1987; Simpson,cheapest wow gold 1976).
B. Individual behavior
1. Navigation. Studies with Adélies indicate that they use the sun to navigate from land to sea. They adjust for the sun's changing position in the sky throughout the day (Sparks and Soper, 1987).
2. Preening.
a. Penguins preen their feathers frequently. Feathers must be maintained in prime condition to ensure waterproofing and insulation.
b. Penguins preen with their bills. A gland near the base of the tail secretes oil that the penguin distributes throughout its feathers.
c. Penguins preen for several minutes in the water by rubbing their bodies with their flippers while twisting and turning over (Marchant,buy wow gold 1990).
Sep 25, 2008 at 10:23 o\clock
The Loudest Animal in the New World
Howler monkeys are named and known for the loud, guttural howls that they routinely use at the beginning and end of the day. They are the loudest animal in the New World and while their howl is not a piercing sound, it can travel for three miles through dense forest.
Black howler monkeys are inhabitants of Latin American rainforests, ranging through eastern Bolivia, southern Brazil and Paraguay,wow gold us and northern Argentina. They are the largest monkey in Latin American rainforests; they grow to be about two to four feet tall and weigh from eight to twenty-two pounds. They have big necks and lower jaws,cheapest wow gold where their super-sized vocal cords are housed.
Male howler monkeys use their big voices to defend their turf. Howls by one troop are answered by other males within earshot. Every-one starts and ends the day by checking out where their nearest competitors are. In this way, they protect the food in their territory. It’s an important job because their diet is made up mostly of leaves—not a particularly nutritious food. Finding young, nutritious leaves is a priority. Fruit and flowers are also valued so it’s crucial that the troop stakes its claim on these treasures when they are found.
Interestingly,buy wow gold when there are few howler monkeys in an area, the howling routine takes on a different pattern. In Belize, where black howler monkeys were reintroduced into a wildlife sanctuary, the howler monkeys were heard only a few times a week rather than every day. Apparently,cheap wow gold with plenty of space and no other howler monkeys, there was no need to check on the whereabouts of competitors. As the population grows and new troops are established,buying gold for wow there will be more reason to check in with the neighbors. At the Zoo,buy cheap wow gold keepers will use recorded howler vocalizations from a distance to try and elicit the territorial calls from the monkeys as they would do in the wild.
Despite the volume of their howl, it’s disorienting to try to find a troop of loud howler monkeys in the wild. They hang out in the treetops where younger, greener leaves are abundant. However, if you do find yourself in the rainforest and it seems that an unusually large amount of fruit is falling from above or a fine spray of urine rains down on your head, you will know you are close!
Sep 25, 2008 at 09:42 o\clock
Can Extinct Galapagos Tortoise Be Bred From Living Hybrids?
Genetic traces of extinct species of Galapagos tortoises have been found in their descendants living in the wild, Yale University announced this week. Now the researchers want to try to revive at least one of the species that have gone extinct by selectively breeding it out of the living hybrid population.
"Museum specimens and current molecular technology,Guild Wars Gold coupled with 15 years of field work studying the tortoise population present now on the Galapagos archipelago has painted a new picture of the origins and future of some of the tortoises,buy cheap wow gold" Yale evolutionary biologist Gisella Caccone and colleagues said.
The work was funded in part by the National Geographic Society's Committee for Research and Exploration and published in the Proceedings of the National Academy of Sciences.
When Darwin first visited the island of Floreana in 1835 and wrote about the giant tortoises, heavy human exploitation was already decimating the population, the scientists noted. Within a few decades, 4 of the 15 known species had disappeared. On some islands, tortoises were sacrificed for oil that was used to light the streetlights of Quito, Ecuador.
Others were taken as food or ballast for pirate and whaling ships.
"Matching museum specimens to current populations showed both distinct lineages and intermingled species," the researchers said. "Of particular note,cheap Everquest Platinumcheapest wow gold the team found tortoises on Volcano Wolf of the island Isabella -- the furthest separated island of the archipelago -- that had both the mitochondrial DNA and nuclear markers of the Floreana lineage."
Perhaps some of the tortoises collected on Floreana for ship ballast were jettisoned on Isabella island, where they interbred,buy wow gold the scientists speculated.
Hybrids of the extinct Floreana tortoise line theoretically now could be bred, the researchers say, and over a long span,cheap wow gold revive this species. An expedition on Volcano Wolf is planned in December 2008 to look for tortoises bearing the Floreana lineage.
Work is also under way to completely sequence the tortoise genome to gain a better understanding of these animals.
