Western Bluebirds, often accompanied by Yellow—rumped Warblers, like to feed on berry—producing shrubs near oak woodlands. About seven inches in length, they have distinct chestnut—red colored breasts and blue feathers and tails; males have blue heads and females have grey heads. Besides snacking on winter berries, they catch insects in flight and also forage for invertebrates on the ground.
Fun Fact Western Bluebirds do not have blue pigment in their feathers. The way light hits the feathers' microscopic structure creates the blue hues that we see. The shiny, intense blue colors come from iridescence, the same process that colors soap bubbles. The Tyndal scatter effect, which also colors the sky blue, creates the dull blue colors in the feathers.