Yesterday I cleaned the cage rather late and pulled them out, putting the others back in. Joy! Ecstasy! They flocked to them, perching first on one, then the other. At this time of year they are usually moving into their nests by 4:45, and by 5:00 all but maybe Hermit or Patch, who like to stay up late, have settled in. Last night at 5:30 they were all still out, flitting from one perch to the other, sitting on them in groups, clearly beside themselves. Even when the first of their lights went out, they were still reluctant to go to nest, apparently reluctant to end this happy day.
I had no idea those perches meant so much to them! I guess they are permanent fixtures, now and forever.
