This mountain bluebird isn't actually blue

This color is blue which we see on a bird the way the wings are interacted with light waves. Blue is different from any bird species it can blue. It is called carotenoids which eat food. These red and yellow feathers get real pigments from their colors. It is a structural color blue in other words.

It is called the arrangement of protein molecules and its carotene. A blue wing under its ultraviolet light can look equally gray for the eyes of humans, it reflects the light of different keratin structures in different ways so that our eyes Color looks in blue color.