Myth 2: Polar bear fur is fiber optic (NOT!)

by Stephanie Chasteen on September 16, 2007

polar-bear.jpgThere’s this myth floating around that polar bear fur is fiber optic. It’s not. It’s not it’s not it’s not.

The myth goes like this… polar bears are white, but they have to keep warm in the winter. But white reflects light and heat, so how do they do it? By having fiber optic fur. “Fiber optics” are a type of “light pipe” that channels light extraordinarily well, sort of like an electric wire does for electric current. So, this is supposed to heat them up by channeling light to their black skin.

This is based on research that showed that polar bears are white to you and me, but don’t emit any ultraviolet (UV) light (they’re black in the ultraviolet). They thought the UV radiation was being absorbed by fiber optics and transported to the skin. It turns out instead that polar bear fur just absorbs UV on its own because of what it’s made of. So this is an example of an early, incorrect science report getting circulated and taking hold in the popular mind.

This myth gets perpetuated by the fact that polar bear fur is hollow. Fiber optics are also hollow, but not every hollow thing is a fiber optic (this is like the “a square is a rectangle but a rectangle isn’t always a square” thing).

Paul D. has an SEM picture of polar bear fur on his website (and some more information).

I was interviewing a scientist/economist (who does a lot of popularization of science) once and he mentioned that “polar bear is fiber optic” as he was discussing solar energy. I told him that, indeed, I had only recently found out that that is a myth, and asked him to retake his answer without that reference (since this was for radio). He did, but I thought his manner was odd. I saw him speak — for a LIVE TELEVISION BROADCAST — on solar energy a few weeks later. And while I sat there flabbergasted in my seat, he repeated the “polar bear is fiber optic” myth right there in front of the cameras!

Do a Google right now for “polar bear fur fiber optic” and you’ll find a variety of links, many of which shed doubt (and some which don’t) on this myth. I wonder if he researched the topic and found something compelling to convince him it was true, or whether the story was just too good to drop? So, this is how myths are perpetuated.

{ 5 comments… read them below or add one }

comansenseisunderrated July 2, 2008 at 7:56 am

Glad to hear some commonsense on the whole poalr bear hair thing. I’m originally from Churchill, Man. It’s also stated in many, many, many papers and on the net that polar bear skin is black, so it can soak up heat from the sun. Think, people!! Were do polar bears live? It’s dark all winter long! How do they soak up anything from the sun when it doesn’t exist for aprox. half the year?

DX-48 July 16, 2008 at 5:01 pm

i have to agree, the black skin isnt even visible so it cant be used to catch sunlight. No, i think the polar bear fur, being hollow, keeps a layer of insulated air between the bear and its frigid environment. seems like a more believable answer then black showing through white, or fiberoptic fur(fiberoptic wires are a synthetic, aren’t they?)if it were that easy, we could just shear the hear and spin it for the wires, like sheep.

Alfred April 2, 2009 at 9:22 am

“Fiber optics are also hollow, but not every hollow thing is a fiber optic”

Optical fiber is NOT hollow. Anyone who has terminated one can attest to that. They are solid glass with a reflective cladding. Let’s not let any other rumors start here.

Fiber Optic June 27, 2009 at 1:55 am

Well, a Fiber Optic is a solid structure commonly made out of glass ( other materials like plastic are also used to make specialty fibers). However, commonly used optical fiber used in telecommunication is made out of glass. A fiber optic has 3 main structural sections core, cladding and jacket. Jacket is a protective cover over core and cladding and has no role in transferring light from one end to other. The light is solely transmitted by core and cladding glass structure. Hope it helps.

Dave May 25, 2016 at 8:39 pm

Why is it that polar bear hairs do not behave like a fibre optic? Why can’t UV rays travel through the hair? Is it related to the material of the polar bear hairs?

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