by Pajarita » Tue Dec 13, 2016 4:57 pm
I had two umbrellas, both females and both came to me as adults from a pet store where the owners had left them on consignment. They were fed just seeds and kept in a cage in a dark corner so I bought them both. I taught them to eat good food, got them friendly with people and sent them to a cockatoos-only sanctuary where they are still doing VERY well.
Now, I don't have a huge experience with toos but all the ones I've had (2 umbrellas, 1 lesser, 1 Eleanora and 1 citron) were excellent eaters so it's just a matter of persistence and time. All of mine ate gloop and raw produce for breakfast (and they are such good eaters that they actually eat the greens first!) and nuts/seeds for dinner (but it's mostly nuts). The trick is to wait about an hour or so after dawn (so they are good and hungry) and eat the raw produce with them so a to get them into the habit (you won't need to do this forever, he will eat on his own once he gets 'into it'). Make a simple gloop with just grains and fresh corn, peas and carrots mixed in and add a small sprinkle of seeds to it and leave it there all day long even if he doesn't touch it. Don't give him any other food during the day and, in the evening (actually, when the sun is halfway down to the horizon), take away the gloop and produce and give him his nut/seed mix (only enough to fill his crop) and, once he falls asleep, take the bowl away so he has nothing to eat in the morning until he gets his produce and gloop. If you keep on doing this, he will start eating it.
I don't know why the vet did not make a big deal about his diet, he should have because, obviously, it's a terribly unhealthy one and it needs to change asap.