An online resource based on the award-winning nature guide – maryholland505@gmail.com

Blue Feathers

The colors in the feathers of a bird are formed in two different ways, from either pigments or from light refraction caused by the structure of the feather. Red and yellow feathers get their color from actual pigments (carotenoids) that come from the bird’s diet. Blue, however, is a structural color, created by the way light waves interact with the feathers and their arrangement of protein molecules, called keratin.

Thus, no birds have blue feathers made from pigments – they are blue strictly from the structure of the feathers.  Different keratin structures reflect light in subtly different ways to produce different shades of what our eyes perceive as the color blue.

If you observe the blue feather of an Eastern Bluebird, Blue Jay or Indigo Bunting in normal lighting conditions you will see the expected blue color. However, if the feather is back-lit, and the light is transmitted through the feather, it will look brown. The blues are lost because the light is no longer being reflected back and the brown shows up because of the melanin in the feathers.

Naturally Curious is supported by donations. If you choose to contribute, you may go to http://www.naturallycuriouswithmaryholland.wordpress.com and click on the yellow “donate” button.

3 responses

  1. Alice

    Beautiful Blue Jay. That explains a lot and great knowledge to remember.

    November 29, 2021 at 8:17 am

  2. Well that is just fascinating! Thanks Mary for your continued knowledge infusion!
    Cheers,
    John

    November 29, 2021 at 9:15 am

  3. Char Delabar

    >

    December 1, 2021 at 8:30 pm

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s