When you see an unusual bird in your yard, review these three points.  If you are still convinced you have a rare bird, get a clear picture and send it to the Cornell University of Ornathology.  I know you will be describing it in your annual Bird Count .  They have helped me several times as I progressed in my ability to identify birds.  They are a great resource, and its free!

1.  Molting is a transition stage from season to season when their old feathers are replaced with new ones.  Yet not all breeds and sexes experience it at the same intensity.  The duration of the molt process varies by species as well.
2. Juveniles in your back yard keep their plumage for only a short time, so they are hard to get to know.  Often, the best giveaway is that you see a recognizable parent feeding the cryptic young.  Often juveniles are more spotted or streaked than their parents while others are just dull and nondescript.  Youngsters are seldom colorful.
3. Unfamiliarity can be a challenge in the beginning and yet you can and will get better.  Get a good pair of binoculars and observe the different markings of feathers, eyes, size, and mannerism.  Get a good field guide and keep it handy.

Welcome to our world of exciting and rewarding birding!