My TT (lame) male bird just came up to me in the pen while I was sitting there, and I noticed his lower beak is split lengthwise. It doesn't extend as far as his tongue, and so far he is eating and drinking okay. It looks as though it may have been there for awhile. I'm worried if it gets worse it could prevent him from eating. It doesn't look broken or injured -- maybe it split from the dryness or some imperfection in how the top beak is hitting it? It's slightly off-center. I don't know if he'll let me take a photo of it.
Has anyone ever had to treat this?