Wow, where to begin. About 5 or 6 years ago, I bought a half dozen young budgies from a very reputable local bird store and put them in a large aviary (it's about the size of a big refrigerator), where they have lived quite happily and healthily, with very few problems. They were intended to add ambiance in my study, and not be six pets that are handled. On the advice of the dealer, I got six males, or so I thought.
One of the birds' ceres turned brown soon after I got them, but some research and advice from others said that this is a condition that can happen from time to time and not to worry. So things went on their merry way. The bird with the brown cere always seemed a little less healthy than the others, but not to the degree that raised concern---it ate well (and they have a balanced diet of seed, protein and greens) and had a favorite toy that got plenty of wear.
This morning, I noticed some red fleshy tissue at the cloaca and what seemed to be an egg protruding from it. I was shocked by the egg, though I was familiar with cloacal prolapse, and took the poor thing immediately to the vet. Well, it was an egg and he has always been a she! The vet reversed the prolapse, removed the egg and gave her an antibiotic shot.
I took her back home and replaced her in the aviary, putting a water dish next to the perch she seems to have gravitated to. She seems a bit woozy and I am keeping the aviary warm. A couple of the other budgies have come over to her, it seems to "visit." I decided against putting her in a hospital cage or medicating her by hand because these budgies are not used to being handled and I don't want to stress her. She also has a tumor on her breast that may or may not be serious, so, given her age, the best thing might be to leave her alone.
Any advice as to what else I should do for now?
And, assuming she recovers, do I need to worry about the fact she is the only girl in the neighborhood?
I wonder if she should be considered lucky after all these years as the only girl, or I should feel sorry for her. The vet recommended against installing a nesting box at this stage. Is that right? This whole thing stumps me.
What also surprises me is that I never noticed any unusual behavior by the other budgies toward her---for example, I also keep turtles, and let me assure you, you can tell that the boys are hot and bothered over the girls and that the girls don't always appreciate that! And, I never saw any broken eggs at the bottom of the aviary when cleaning it.

