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I'm glad you found us. I think we can help you. One of the things I agree with is that a single flyer can not be released. Flyers are colony dwellers and depend on the colony for survival. While it is possible to successfully release a group of flyers, it is not advisable to release a singleton. The survival rate would be low. Rehabbers try to incorporate singles into a group that is being prepared for release. With that said, flyers do make great pets. They do bond to people and can be good pets if you can handle the nocturnal 'thing'.
I'm not a big fan of the NutSquares. When someone doesn't want you to seek 'other' advice, it sends up a red flag for me. We should all be on the same page or at least close. I have 2 male flyers. One is 8yo and the other is 6yo. I purchase the Picky Eater block that Henry's sells. They make a high protein block specifically for flyers (and baby squirrels) but my boys don't like them so I use the Picky Eater block. Along with the block, they eat an assortment of veggies. Flyers have higher protein requirements than tree squirrels so their diet must include protein... meal worms or WaxWorms. My boys prefer the WaxWorms. They get a pinch of oatmeal (the real oats not quick oats). The also get a small piece of fruit. They like apple, love orange, blueberry, watermelon). The fruit should be limited. In the morning whent they are going to bed they get 1/2 of an almond. Yes, I take a single almond and split it. They each get 1/2.
Are you familiar with the calcium requirements of squirrels including flyers and how the diet can adversely affect their health? If not you should probably read up on Metabolic Bone Disease. Nut and seeds must be limited because they are extremely unhealthy. They are high phosphorus foods. Phosphorus and calcium have a metabolic balance in the body. That balance is 2:1 (Calcium : Phosphorus) If the diet is high in phosphorus like nuts and seeds the body will pull calcium from the bones to try to maintain the balance. This is what causes MBD. It is fatal if not treated. With this in mind, I would give the Nut & Berry mix to the birds. Your baby can have a tiny pinch as a treat but not as a part of the diet. Any treat foods must be limited or they will stop eating the healthy foods and wait for the treats.
Another thing we feed is mushrooms. They are high in Vitamin D which is important for calcium utilization. They eat the gills.
SO, this gives you a start.
By the way, that is a handsome boy you have there.