Why Is Blue So Rare in the Animal Kingdom?
Are Blue Jays Really Blue?
Fast Fact: Blue Jays
MLB: Blue Jays take smart leap of faith in Berríos extension
How Do Animals Get So Colorful? - The Atlantic
The wings of Bluejays are so awesome when they are open! : r/interestingasfuck
5 Unique Blue Jay Facts You Likely Didn't Know - BIRD BITES
Naturalist thinks blue jays don't deserve the bad rap
The Recorder - Speaking of Nature: Blue jays
Nature News: Bluebirds aren't blue, but use structural coloration