Blue jays aren't blue

They look blue to me, but the bird plumage is brown. Really? 

Blue jay on a palm tree - Photo: Still Gravity.
A brown Blue jay? Are you serious?  - License our images here. 

Yes. All is about light refraction. Welcome to the world of structural colors. Look for the explanation on this page of The Cornell Lab.

Close up of the structural color of the tail of a blue jay - Photo: Still Gravity.
The structural colors of the Blue Jay. Amazing illusion.        

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