In case you haven't seen it, here it is:
My reaction to reading this:
The idea is that if you use colors that occur in nature (like bird color), you can save yourself the headache and worry of using online color generators for your designs. I've also seen this from other designers using existing furniture colors or interior design posts.
To test it out, I googled "Rare Birds" and "American Birds" and grabbed a bunch of photos. I sorted each bird into 5 color samples. Using the eyedropper tool in any design software, grab a color that's the closest white or gray, a color at the top of the bird's wing, the bird's stomach, the darkest color, and the bird's beak color.
Here's an example of a robin:
Here's an American Kestrel: