He used to bathe with gusto whenever I provided his birdbath (3-4 times a week).
I have not changed the bath or anything (it's the square-ish PennPlax one with the see-through top portion that mounts outside the cage on the door opening).
His appetite, activity level, and appearance have not changed - I'm surprised he doesn't stink and look a mess at this point!

And he continues to belt out songs off and on from sun up til sun down.
During this time, the most he's done with his bath is perch on the edge opening and flick some water around with his beak.
Any ideas as to what could be wrong (if anything?)
