Wednesday, April 22, 2009
Polar Bears.
The main cause of the depleting number in this majestic creature is global warming. Global warming is caused by the human race. We have invented millions and millions of new products in the past century that contribute to the thinning of the ozone layer, causing the earth to heat up, melting the polar bears' homes - the sea ice in the north pole.
Polar bears eat mostly seals and other fatty marine mammals that they hunt from the ice. As you can see, these innocent polar bears don't know what is happening to them. As the ice climate gets warmer, ice is melting early in the summer and freezing later in the winter. Polar bears spend less time on the sea ice, which means they have less time to hunt seals and build up fat reserves. This can mean female polar bears have trouble providing milk for their young. If female bears don't reach a minimum weight, they won't give birth at all. On top of that, the bears will eat one another when they cannot find enough food to fill their tummies. :(
Oil spills from tankers also threaten polar bears' lives. When their fur is covered with oil, the fur loses its insulating properties. The oil spills will also contaminate the food sources of the polar bears. That will make the polar bears ill or even die of poisoning.
Today, polar bears are also hunted by native Arctic populations primarily for food, clothing, handicrafts, and sale of skins. Polar bears are also killed in defense of people or property. However, Hunting is government-regulated in Canada, Greenland, and the United States. Hunting is currently banned in Norway and Russia.
Hallucigenia bring us back to date more than 500 million years to a time known as the Cambrian Period when most of the major groups of animals first appeared. The Cambrian Period was also a time of evolutionary experimentation in which countless bizarre body plans were tried out and then left behind in the primordial soup. One particularly odd set of fossils come from an area of the Canadian Rockies known as the Burgess Shale, including a strange little arthropod named Hallucigenia.
Hallucigenia gets its name from its body plan, which appears to have been designed by someone under the influence of psychedelic drugs. It has an elongated body with a row of tentacles on one side and a string of stiltlike spines on the other. At first, researchers had no idea which way to orient the animal — on its tentacles or on its spines — but chose the spines since the tentacles appeared to have mouthparts on the end of them. However, recent evidence suggests that Hallucigenia's tentacles were actually paired appendages used for walking and that the spines were most likely for protection from predators. Based on this discovery, Hallucigenia was finally turned right side up.
Okay, maybe 500 millions years ago extinction has nothing to do with our human selfish act towards mothernature. So I ll be realistic ... on the next article Im gonna present to you all :D
P/s :Its not something cute.
Who knew pigeons could be extinct? we see them everyday.The earliest settlers in the New World were amazed by the passenger pigeon, a bird with flocks so huge that it would take days for them to travel overhead, blackening the sky as they passed. Any farmer who had the misfortune of hosting passenger pigeons for a meal would quickly find his entire crop decimated within the blink of an eye. Then, virtually overnight, the most abundant bird in North America suddenly disappeared from the planet.
The extinction of the passenger pigeon is an example of nature coming into direct conflict with man. Its population numbered an astounding 3 to 5 billion when the first Europeans arrived in America. However, there was not room enough in the New World for both species. Passenger pigeons were soon wiped out due to merciless hunting, deforestation and other factors related to humankind's ever-expanding range. The extinction was only becoming apparent at the start of the 20th century; by 1914, the last known bird was dead.
Mling signing off :P