Manual The Peacocks Tail

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Contents:
  1. The Physics of Peacock Tail Feathers Is Even More Dazzling Than We Realized
  2. The secret signal in a peacock's tail
  3. Peacock Tail Feathers
  4. 10 Feathery Facts About Peacocks
  5. The eye feather

Jan 08, Promiscuity could reduce benefits of successful mating, research shows Jan 19, Apr 29, Nov 18, Recommended for you. Scientists uncover genetic similarities among species that use sound to navigate Oct 04, Oct 03, Oct 02, Why are there no animals with three legs? User comments.

Feb 02, So hundreds of research studies on vertebrates are wrong because one upon the peculiarities of how female flies get aroused after a brief encounter with two male flies of different sizes? Darwin's theory might be wrong and reflect attitudes of the Victorian period but this work is irrelevant to whether that is or is not the case.

The Physics of Peacock Tail Feathers Is Even More Dazzling Than We Realized

Report Block. Feb 03, There's another theory - the feathers are used to deter predators. If eyes are considered repulsive and "dangerous" to predators butterflies, blue-ringed octopus , why not peacock feathers? Nearly every study has been done on captive birds with the assumption peacocks are polygamous.

The secret signal in a peacock's tail

With predator pressures in the wild, this may not be the case. Yes, sexual selection is still involved because females may choose healthier dominant males. Consider that these animals have been in an evolutionary arms race with reptiles snakes and lizards.

Indeed, the sound created by shaking their quills may mimic snake hissing. Sign in.

Peacock Tail Feathers

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10 Feathery Facts About Peacocks

Send Feedback. E-mail the story Peacocks might not shake those tail feathers for the reasons you think. Your friend's email. When your body fights an infection like the common cold, lymph nodes in your neck might swell as they make more germ-fighting white blood cells. Apollo 11 Astronaut Buzz Aldrin is seen setting up scientific instruments on the moon. They include a seismometer to measure moonquakes and a mirror array to measure the distance between the Earth and moon.

The lunar lander and an American flag can be seen in the background. Those items also were left on the moon. People with diabetes monitor their blood sugar to avoid organ damage.


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Many take drugs that affect insulin, a hormone that controls blood sugar. Researchers are exploring ultrasound as an alternative to those drugs. Brain scans from 33 dog breeds revealed a broad variation in regions involved in scent hunting, guarding and companionship. Like other crystals, its chemical building blocks repeat regularly. Skip to main content. Lab Scientists Say Analyze This! Technically Fiction. Gravity Waves. Current Issue.

alchemy and the peacocks tail

Animals Evolution. When Darwin got sick of feathers.

The eye feather

The man who started evolutionary biology had some bad moments over a bird. Susan Milius. Feb 11, — am EST. Readability Score: 6. However, they also vibrate their feathers at or near the natural resonant frequency, enabling them to produce strong displays while using the least amount of energy. Kane draws an analogy to a child on a swing. Simply pull the swing and let it go, and it will swing back and forth at its natural resonant frequency.

Time the additional pushes just right, so that they are at the same frequency, and it will swing even higher and faster. Push at just above or below that frequency, and your efforts will have very little effect on the swing. But peacock feathers rub up against each other all the time, so they produce lots of friction. That means a peacock can shake his tail feathers at a wider range of potential resonant frequencies and still be reasonably energy efficient.

One such resonant frequency is used in train-rattling, while another corresponds with train-shivering.

But the underlying physics is the same. This is not the first time physicists have been fascinated by peacocks. In the 17th century, Isaac Newton thought their vivid, iridescent colors were the result of the same phenomena that causes similar shifting colors in soap bubbles and oil films. His contemporary, Robert Hooke, was the first person to examine peacock features under a microscope, noting the ordered structure of their barbs, and how they served as tiny hooks to let the individual feathers function as a whole.

He imaged peacock feathers using scanning electron microscopy to get a closer look at their highly detailed structure. This revealed that eyespots have a slightly different structure than the other feathers in the tail. Specifically, their barbs, or micro hooks, are locked so tightly together that they are denser that the surrounding feathers, which have looser barbs.