The vet had one more comment about Gus ... Husband was describing the incessant regurgitation and ripping up of paper which he thinks is nest-building. I'm not sure about that...don't all macaws rip things to shreds? Vet asked if he was doing the guy pleasure thing, we said no. Vet thought that sounded like female habits, but a check of the records showed he had been DNA sexed as male. Vet said, do you think he's homosexual? We said what? He said he knew of cases where, for example, a pair of birds had regularly mated and laid infertile eggs, and finally tests showed that they were both female! He thought it was not uncommon for parrots to exhibit a degree of gender bending, so to speak. Gus might be presenting more hen-like mating behavior, though he's a guy. LGBTP?
It adds yet another layer of head scratching material for us. When I get home, I'm going to make a cover for his cage to shorten his days and see if that disrupts the pattern. But the paper ripping - isn't that ok? I don't know if it simply lets him stay busy so he's not bored and doesn't pluck, or if it amplifies the hormonal stuff. He sure does love ripping!
I asked about the bare places on his body, and the vet explained that feathers grow in tracts leaving much of the body bare. He showed me how the belly had no feathers, but was covered by the feathers from the tracts that ran down either side. Makes sense - feathers are expensive, and feathers all over a parrot could make them overheat. Certainly one of the most surprising vet experiences for me.