Male Eastern Bluebirds are vivid, deep blue above and rusty or brick-red on the throat and breast.
Females are grayish above with bluish wings and tail, and a subdued orange-brown breast. 
Juvenile plumage is browner with white streaking above and dusky spotting below.
Juveniles have a white eye-ring.
Eastern Bluebirds live in meadows and openings surrounded by trees that offer suitable nest holes.

1st & 2nd photo: A female. Cape Cod, Massachusetts, USA, 10 August 2017
3rd & 4th photo: Juveniles. Cape Cod, Massachusetts, USA, 10 August 2017
5th photo: A young male. Ipswich River Wildlife Sanctuary, Ipswich, Massachusetts, USA, 21 September 2009