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When peacocks are ready to mate, they fan out their iridescent tail feathers (known as trains), before rushing at females, shaking those feathers to catch their attention.
But when researchers discovered low-frequency sounds—which are inaudible to humans—coming from this “train rattle” several years back, no one knew how they worked. All they knew was that peahens perked up and paid attention to recordings of these “infrasounds,” even though they couldn’t see the males.
To find out what was going on, Suzanne Kane, a biological physicist at Haverford College in Pennsylvania, and her colleagues decided to look at the feathered crest on top of the peafowls’ heads. During her previous research, she was struck by the resemblance between the short crest feathers—which form a sort of minifan—and the large peacock tail feathers.
Kane and her colleagues gathered the intact head crests of 15 Indian peafowls (Pavo cristatus) and played recordings of the low-frequency sounds produced by the train rattle displays, along with white noise. Using high-speed cameras, they found that the train rattling infrasounds caused the head crests of both males and females to vibrate at their resonance frequency—the point at which they vibrate the strongest—whereas other sounds resulted in little to no movement.
Peacocks also perform a wing-shaking display that Kane says isn’t particularly visually impressive—at least to humans—as it doesn't involve the beautiful tail feathers. However, when the researchers used a mechanical arm to flap a peacock wing in a similar way near three head crests from female peafowl, they found that it caused measurable movements.
“Every time there was a flap the crest vibrated,” Kane explains. This suggests the air flow generated by wing shaking could vibrate the feathers of nearby females, perhaps attracting their attention, the researchers report today in PLOS ONE.
The team cautions that even with the new results, it still hasn’t looked at how female birds respond to these vibrations. Angela Freeman, a biologist at Cornell University who first discovered the low-frequency sounds, says her experiments showed recordings of these infrasounds cause both males and females to become alert and start walking and running, “presumably to locate the signal.”
What scientists need to do next, she says, is figure out how the vibrations are coordinated with other parts of the mating display—and whether the sounds from the shaking tail feathers really do attract the females.
www.sciencemag.org/news/2018/11/watch-peacock-get-female-...
When peacocks are ready to mate, they fan out their iridescent tail feathers (known as trains), before rushing at females, shaking those feathers to catch their attention.
But when researchers discovered low-frequency sounds—which are inaudible to humans—coming from this “train rattle” several years back, no one knew how they worked. All they knew was that peahens perked up and paid attention to recordings of these “infrasounds,” even though they couldn’t see the males.
To find out what was going on, Suzanne Kane, a biological physicist at Haverford College in Pennsylvania, and her colleagues decided to look at the feathered crest on top of the peafowls’ heads. During her previous research, she was struck by the resemblance between the short crest feathers—which form a sort of minifan—and the large peacock tail feathers.
Kane and her colleagues gathered the intact head crests of 15 Indian peafowls (Pavo cristatus) and played recordings of the low-frequency sounds produced by the train rattle displays, along with white noise. Using high-speed cameras, they found that the train rattling infrasounds caused the head crests of both males and females to vibrate at their resonance frequency—the point at which they vibrate the strongest—whereas other sounds resulted in little to no movement.
Peacocks also perform a wing-shaking display that Kane says isn’t particularly visually impressive—at least to humans—as it doesn't involve the beautiful tail feathers. However, when the researchers used a mechanical arm to flap a peacock wing in a similar way near three head crests from female peafowl, they found that it caused measurable movements.
“Every time there was a flap the crest vibrated,” Kane explains. This suggests the air flow generated by wing shaking could vibrate the feathers of nearby females, perhaps attracting their attention, the researchers report today in PLOS ONE.
The team cautions that even with the new results, it still hasn’t looked at how female birds respond to these vibrations. Angela Freeman, a biologist at Cornell University who first discovered the low-frequency sounds, says her experiments showed recordings of these infrasounds cause both males and females to become alert and start walking and running, “presumably to locate the signal.”
What scientists need to do next, she says, is figure out how the vibrations are coordinated with other parts of the mating display—and whether the sounds from the shaking tail feathers really do attract the females.
www.sciencemag.org/news/2018/11/watch-peacock-get-female-...
The ultimate mini-ventilator or 'mini-fan.' This model is small but effective in many a heatwave experienced over the past few years.
Motion by Kingsley Davis
Wanted to wear size 4's again
To run and laugh without a care
To know if you mess up someone will be there to fix your wrongs
Times have changed
Do I grow up? - ctb .
a minifan that my relatives gave me for present. it came with the card. in this fan the picture tells a story.there's men giving two ladies a ride and smoking cigarettes while the child is watching by with the girl near him. btw, i cropped the picture a little for the right angle. and i used the background as a folder.
Image description:
Our baby doll sits excitedly in front of an LED mini fan. The fan changes colors and lights up in different colors, emits wind when rotating the plastic blades, which is pleasant in a warm apartment in summer. Our baby doll Niko, who now prefers to sit without clothes, also uses this. It's coolest that way :) But of course he would like to have his pacifier with him again ;)
About our three dolls:
Ella is a girl doll with a soft cloth body. She is a thumb sucker doll and can put her thumb in her mouth. We gave her doll glasses.
Niko and Paul are two anatomically correct boy dolls. Anatomically correct as both are shown with male gender details. For legal reasons I have to redact this part. We decided on such dolls because we like it when a doll is portrayed naturally. And because Paul has no hair, we gave him a wig from a previous doll.
And we liked the thumbsucker doll because one of our two kids used to be a thumbsucker child himself :)
Image description:
Our baby doll sits excitedly in front of an LED mini fan. The fan changes colors and lights up in different colors, emits wind when rotating the plastic blades, which is pleasant in a warm apartment in summer. Our baby doll Niko, who now prefers to sit without clothes, also uses this. It's coolest that way :) But of course he would like to have his pacifier with him again ;)
About our three dolls:
Ella is a girl doll with a soft cloth body. She is a thumb sucker doll and can put her thumb in her mouth. We gave her doll glasses.
Niko and Paul are two anatomically correct boy dolls. Anatomically correct as both are shown with male gender details. For legal reasons I have to redact this part. We decided on such dolls because we like it when a doll is portrayed naturally. And because Paul has no hair, we gave him a wig from a previous doll.
And we liked the thumbsucker doll because one of our two kids used to be a thumbsucker child himself :)
First flight of the BAe Hawk from Eflight. Setup is 100% stock with the exception of the fan unit, I used a WeMoTec MiniFan 480 instead of the Eflight fan.
The plane flew great. It's very sensitive in roll and looses quite a bit of altitude in tight turns ... but other than that I'm pretty impressed. It will take a little while to get used to how it handles but it will be good fun all along the way I'm sure.
As you will see in the video it might be a good idea to carry a bit of power all the way down to touchdown and don't attempt any crosswind landings (it has no rudder).
My video camera has a hard time staying focused on small fast moving objects, so this video is a whole bunch of short clips edited together with all the blurry bits thrown out.
Thanks a lot to Franz (thenewarea51) for coming out and joining me today and manning the video camera for me.
All images © Allen Rockwell 2009
Fly to this location (Requires Google Earth
How cool it is to have a fan cum charger while you are travelling. Buy Geek 4" portable fan and travel without any worries.
Varsity! Varsity!
U-rah-rah! Wisconsin,
Praise to thee we sing (we sing)!
Praise to thee, our Alma Mater,
U-rah-rah! Wisconsin!
Chili Kickoff - Badger Huddle 2009
Max output 822 watts at 54.1 Amps.
Should deliver 700-800 watts for most of a flight. The Eflight BAe Hawk should perform VERY well at this power.
What it all means:
If I fly at an average of 50 amps (mostly wide open all the time) I'll fly for about 3.84 minutes
If I fly at an average of 40 amps (more throttle management) I'll fly for about 4.8 minutes
If I fly at an average of 30 amps (most likely scenario) I'll fly for about 6.4 minutes
If I fly at an average of 20 amps (not likely, that's too slow) I'll fly for about 9.6 minutes
The MINI Family Mobile intends to surprise the visitors of this year’s “Salone Del Mobile” – the biggest furnishing fair - in Milan. Located at the Zona Tortona, Milans design district, the MINI Mobile shows people a new point of view: Flying cars, lifted off the streets, communicate an impulse for innovative and creative thinking and a new experience.
The term „mobile“ in a visual art sense describes a type of kinetic sculpture in which an ensemble of balanced parts are hung freely in space.
The famous artist Alexander Calder once said: “A mobile is a piece of poetry that is surprising and spinning with the joy of life.”
The project of the MINI Family Mobile was conceived and realized by Future:headz, the idea agency for emotional communication, based in Munich, Germany.
The MINI Family Mobile intends to surprise the visitors of this year’s “Salone Del Mobile” – the biggest furnishing fair - in Milan. Located at the Zona Tortona, Milans design district, the MINI Mobile shows people a new point of view: Flying cars, lifted off the streets, communicate an impulse for innovative and creative thinking and a new experience.
The term „mobile“ in a visual art sense describes a type of kinetic sculpture in which an ensemble of balanced parts are hung freely in space.
The famous artist Alexander Calder once said: “A mobile is a piece of poetry that is surprising and spinning with the joy of life.”
The project of the MINI Family Mobile was conceived and realized by Future:headz, the idea agency for emotional communication, based in Munich, Germany.
The MINI Family Mobile intends to surprise the visitors of this year’s “Salone Del Mobile” – the biggest furnishing fair - in Milan. Located at the Zona Tortona, Milans design district, the MINI Mobile shows people a new point of view: Flying cars, lifted off the streets, communicate an impulse for innovative and creative thinking and a new experience.
The term „mobile“ in a visual art sense describes a type of kinetic sculpture in which an ensemble of balanced parts are hung freely in space.
The famous artist Alexander Calder once said: “A mobile is a piece of poetry that is surprising and spinning with the joy of life.”
The project of the MINI Family Mobile was conceived and realized by Future:headz, the idea agency for emotional communication, based in Munich, Germany.