| Males | Females | Pairs | Nesting | Action |   
   

 by Karen Grant
 ©Karen Grant

 by Karen Grant
 ©Karen Grant

 by Karen Grant
 ©Karen Grant

 Mountain Bluebird
 Sialia currucoides

 Male & Female
 Yellowstone NP, Wyoming
 June 2004

 by Kent Keller
 ©Kent Keller

 Mountain Bluebird
 Sialia currucoides

 Female & Male 
 Dividend (ghost town)
 Utah County, Utah
 24 May 2003

  by Milt Moody
 ©Milton G. Moody