why do polar bears have black skin but white fur
8. What are the biggest threats to polar bears? The is the biggest threat to the survival of polar bears. Because of ongoing and potential loss of their sea habitat resulting from climate change, polar bears were listed as a threatened species in the US under the Endangered Species Act in May 2008. Other key threats include polar bear-human conflicts, overharvesting and industrial impacts. As climate change forces polar bears to spend longer time onshore, they come in contact more often with Arctic coastal communities and others working in the Arctic. in the Arctic are expected to increase in number.
This would likely affect polar bears and their habitat in many ways. Contact with spilled oil would be fatal for polar bears and an oil spill would affect the entire food chain.
There is some debate on the subject, but the combination of black skin and clear fur is probably the best for keeping the polar bear warm while not giving away its position when hunting.
The black color of the skin is the best for absorbing energy from the Sunвobjects that appear black donвt reflect any wavelengths of light. The clear fur allows that light to get to the skin, but still looks white so the bear can blend in with the surrounding ice and snow.
A few years ago, or maybe you heard this recently because it has achieved urban legend status, a rumor you may have heard is that polar bear fur is actually like a fiber optic network for harnessing or focusing sunlight toward the bearвs skin. While this would have been cool, itвs unfortunately completely bogus.
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