I found Tom's "mystery sparrow" yesterday interesting because we normally 
see adult male INBU's as very brightly colored individuals in OH (see 
below). The second year birds (first breeding season) commonly have little 
to a lot of brown mixed in the blue (see below). However, most of these 
"blue" birds leave in fall prior to molting into their basic plumage, 
consequently Tom "sparrow" really stands out as unusual around here. We 
also banded a male INBU last Sunday (along with the hatch year female 
grosbeak and INBU) and it was the first male INBU we had banded in full 
basic plumage (see below). It had a single blue undertail covert.(see below)
We'll be back out at Shakertrace banding this Sunday--we have a huge number 
of birds moving today, so I'm very excited about our possibilities this 
weekend!!
Cheers
Dave