Posted by Steve Rushing on May 25, 2021 at 11:24 am
All of this blue was brought to us by sunlight reflecting off a brown feather. A feather cleverly engineered with air pockets and keratin protein structures by Nature to amplify and reflect light we see as blue. Which discerning female Indigo Buntings find as an ‘honest signal of health’ in a mate. And, quite possibly, like us, just plain old pretty.