Why Some Birds Have Red Feathers

Scarlet plumage has long posed a mystery to scientists—but now they've finally solved it.

How did cardinals get those bright red feathers? (Constantine

The Gene That Paints Birds Red - The Atlantic

Red Bird Strategic

Red, white and blue birds of Pennsylvania

The Facts and Myths About Cardinal Birds – Natural History Society

Indiana's State Bird: The Northern Cardinal - WonderLab

Red Bird Strategic

Two studies find one gene for red beaks and feathers - BBC News

Where Red Birds Get Their Vibrant Hues, Smart News

Solving the mystery of what causes bald cardinals - Farm and Dairy

Red Bird Plumage » How And Why Does It Get That Way? - Bird Buddy Blog

Why Do Some Birds Have Red Eyes? – Nature Blog Network

What's Behind Those Lustrous Red Feathers?

Lammergeiers rub iron rich soil into their feathers to dye them