Video: 'One in a Million' Yellow Cardinal Seen in U.S. Backyard

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A birdfeeder hangs in front of a home destroyed by the High Park Fire, in Bellvue, Colorado west of Fort Collins June 30, 2012. The High Park Fire burned more than 87,000 acres and left one person dead and destroyed 259 homes making it the second-largest and second-most destructive fire in Colorado state history. The High Park Fire is 97 percent contained while the Waldo Canyon Fire, which has burned more than 17,000 acres, left at least two people dead and destroyed 346 homes is 45 percent contained. Robyn Beck/AFP/Getty Images

An Alabama woman who has been feeding birds for decades last month came across an unusual one: A yellow cardinal.

"I thought 'well there's a bird I've never seen before,'" Charlie Stephenson, of Shelby County, Alabama, told "Then I realized it was a cardinal, and it was a yellow cardinal."

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She first spotted the bird in late January, but it has been coming to visit her backayard ever since. If you need to see it to believe it, check out the video below that Stephenson shot.

"I'm used to being a birder and you see some leukocytic ones, you see some albino ones," she said. "But I thought this was something else and then I learned how rare it is."

According to Geoffrey Hill, a biology professor at Auburn University who has written books about bird coloration, the bird is "one in a million." He's been bird watching for forty years and has never come across this type of bird in the wild, he told

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Hill believes the bird's color is due to a genetic mutation; however, other experts have different beliefs on why it's yellow.

It could be due to a poor diet or environmental stressors that have caused the pigments in the feathers to change color, Geoff LeBaron, Audubon's Christmas Bird Count director, explained on the National Audubon Society's website.

However, LeBaron acknowledges that genetic mutation could also be at play.

"Time will tell with this bird," LeBaron said.

If it stays in the area and is yellow again next winter, it's most likely a genetic mutation. But if it sheds its old feathers and the new ones are red, it has something to do with the cardinal's pigments.