Male Eastern Bluebirds are vivid, deep blue above and rusty or brick-red on the throat and breast. Blue in birds always depends on the light, and males often look plain gray-brown from a distance. Females are grayish above with bluish wings and tail, and a subdued orange-brown breast. © Alix d'Entremont | Macaulay Library.
The male is easily recognized by its bright blue head and back (lighter than the closely related Indigo Bunting), its conspicuous white wingbars, and its light rusty breast and white belly. The color pattern may suggest the Eastern and Western Bluebirds, but the smaller size (13–14 cm or 5–5.5 inches in length), wingbars, and short and conical bunting bill quickly distinguish it.
The first bird that pops into my head is the Tufted Titmouse. It is mostly grey with a crest on the top of its head, (like the Northern Cardinals crest, only a different color), a white breast.