T was right. There are two of 'em. And from the way they were squealing and waving their tails around a few moments before this picture was taken, I'm guessing one male and one female, and some courtship ritual going on.
The finches have also been chatty and posturing along the back fence, and snuggling up along the rain gutters. That's better than in the house, which seems to still be bird-free.
Katie is watching all this action intently, but she has already proven that she is a big sissy when faced with actual prey.