As with most other blue-hued birds, the blue jay’s coloration is not derived from pigments but is the result of light interference due to the internal structure of the feathers; if a blue feather is crushed, the blue disappears because the structure is destroyed. This is referred to as structural coloration.
H.J. Ruiz - Avian101 
An interesting post, thank you. I didn’t know about structural colouration.
Thank you, Susan. It is really fascinating to me. 🙂
I entered your Friday Blue gallery without any welcome 😀
Beautiful pictures of Blue Jay!!
You’ll always be invited to enter my galleries. Thank you, Indira. 🙂
I love the beauty of blue Jays. I find your explanation quite interesting, H.J. thanks for sharing that little tidbit.
They are incredibly beautiful birds. It’s good to know more about birds. Thank you, Jane. 🙂
Before I got into birding I never realized how often I hear or see Blue Jays! And I never get over their beauty.
They are impressive birds. Thank you, NJUF. 🙂
Beautiful HJ ! I love your Blue Jays
Thank you very much, Ashley/ 🙂
Very interesting post HJ. I did not know about the coloration of these beautifil birds.
Thanks, Chris. Indeed! 🙂
Wonderful shots, HJ! You really have some awesome cooperating Jays for photo ops!
Thanks so much, Donna. Just mutual cooperation…they pose, I feed them! 🙂