Hi, thanks for the reply. That certainly sounds like the case with mine. The one who does the singing does seem to have a more swollen beak base than the other. His plumage is slightly imperfect, but I suspect that is genetic rather than condition. The one we thought was a female seems very subdued this morning, while he is singing his heart out. Either she is a female or he has now become submissive.

I will certainly keep an eye on them.

Thanks once again.