Just wanted to give some updates! We are still doing hand feedings 2x a day, but I now have a new job that allows me to work from home, so I've pushed his morning feeding from 6am to 11am so he can sit in his hunger a bit and be more enticed to eat food on his own in the morning. I do see him eating more and more on his own, and his water bowl is genuinely dirty by the end of the day. Look at his weight chart.

We're slowly trending up (lbs should be g -- I do not have a 900 pound macaw in my house). I'm not sure at what point I should expect him to cap but I'll let him set the pace.
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Other photos:
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His feathers are looking better now, and we have flight feathers coming in!!!
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His favorite thing is to just look outside the window in the evening. I keep the pillow there so he can go stalk the neighbors whenever he wants.
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I have ordered 2 stands from
@Wingdow so that he has some actual stations around the house, because he's been using a stair ladder until now.