While I'm sure the Society Finsters know that Decaffeinated is gone, I'm not too worried about them. After all, they've always piled together. If they have favorites, I can't tell. But Frank is a different story.
Finches are social creatures, and will get depressed and lethargic if forced to live alone. Even though Frank isn't the only finch in the house, he is the only White-Headed Nun, so I have to keep an eye on him to make sure his general health doesn't degrade. The good news is that he's been active and curious since Sally died. In fact, he's done several things since her death that I've never seen him do before, including sitting on the peach concrete perch (it's a bad photo, but it's proof), checking out the
perch with the cuttlefish bone, and eating crushed shells from the little dish hanging on the wall. One night, he even tried to settle down to sleep on top of the nest box that the Society Finsters sleep in! But they must have been surprised when he started rustling on their roof, because they chased him off.
Frank's activity is a good sign. White-Headed Nuns are a bit hard to find, and it'd be even harder to find a female around his age (he's getting old for a finch). But, I'd happily get him a sweet young thing to be his companion, if he decides he needs one.