Red Headed, Red Bellied...What's the Difference?

My seven-year-old has become a bird watcher of sorts.  He has bird books, researches birds, and spends as much time as we'll let him outside watching the birds.  Bird watcher, right?  And he's at the point now where he rarely sees a bird he doesn't know. 

His momma on the other hand, not so much!  Consider the conversation below Exhibit A:

(Momma looks out back and sees a woodpecker)

Cameron, look, there's a Red-headed Woodpecker back here.

 

(Child excitedly comes to the window) Where?

 (pause)  Oh, that's a Red-bellied Woodpecker, Mom.  The Red-headed ones have a totally red head. 

(walks away)  I already saw a Red-bellied Woodpecker today.

(Has a moment of sensitivity)  But it was nice to see a second one.  Thanks, Mom.

This momma now knows more than she did before!