The best part of being a rehabber of wild birds, was getting them healthy and able to care for themselves, and release them. I was an operating room nurse for a lot of my working life, so I often sutured and bandages the birds myself. In fact I remember being brought a peacock with a clean cut of the belly. I sutured it with bright blue skin suture. I thought that would be the easiest suture to find again and remove. I clipped the peacocks wings to allow it free run of an open pen but contain it until it healed. That bird took flight, clipped wings, suture and all!
That was very unusual.
For the most part the birds stayed with us, each in a separate muse, a few months until their injury healed. Then the bird was moved to a long flight pen, to regain flight strength. Finally we could release them. I will attach a photo of Jim releasing a red tail hawk and owl.