Birders and biologists are reportedly heading to Alabama after pictures of a yellow cardinal started to circulate online, AL.com reported. Geoffrey Hill, a biology professor at Auburn, told the website that the cardinal in photos appears to be a male and carries a genetic mutation, hence the bright yellow plumage. The bird was first spotted in January. "I've been birdwatching in the range of cardinals for 40 years and I've never seen a yellow bird in the wild," Hill, who is on sabbatical in Australia, told AL.com via email. "I would estimate that in any given year there are two...