lovezebs , our instincts were correct.
Our latest gouldian baby does have a limb difference:

It would appear that very early in life, her backwards-facing toe was broken.
It healed improperly and now faces forward, so essentially, she cannot grasp anything with her right foot.
The outermost toe tends to curl under the others as she's putting her weight on the outside edge of the foot. But that toe is actually normal. It's just the backwards facing toe.
The foot is all there, so I suspect this is an injury vs. a deformity.
It is fully healed, so it must have occurred quite early on.
I looked for an obvious deformity the other day, but it wasn't apparent to me. The appearance varies according to where and how she's standing. I really started to suspect a problem, though, as she has been quite late fledging and she had the odd habit of standing inside the nest.
She is perching, though and she's using the deformed foot as a "helper foot" for balance. She's sitting low on the perch, so I imagine she'll need to work on getting her good leg strengthened and working out her balance. I'm not worried, though. She's very peppy and alert. And we all know that a bird can live a good life with one leg.
I'll need to keep an eye on her to ensure that she doesn't develop sores since she is applying some pressure to the foot.
I took her out to band her and examined it fairly quickly. She was quite stressed, so I put her back. I was able to determine that it's definitely healed -- not dangling. It's either fixed in that position or very stiff.
I'll examine her more extensively later to see whether that toe is fixed or whether there's still a joint there. If there's still a joint, it may simply be a matter of wrapping it in a manner that gradually stretches the ligaments and other structures. Essentially, stretching her closed foot into an "open" position.
My only concern is that this may make her more prone to getting caught up. I'm going to start working with her daily to tame her, as she will need regular help with that foot by way of nail trimming, along with any physical therapy measures that we can figure out for her.
Has anyone ever seen this particular injury/deformity in a baby?
Sydney is in the middle.
