If the animals are going to be put back in the wild, it is very dangerous for them to get used to humans providing for them. It takes away the natural fear they need of people. When the birds are being fed during rehabilitating, it is important that you do not let them aspirate on food or liquid. What happens if they do start aspirating is that the food or liquid has gotten into their lungs and can cause severe complications. Once this happens, there is not much you can do about it and all you can do is hope that the bird is strong enough to expel it himself.
Tube feeding a baby animal is just as dangerous.
You have to precisely measure how far the tube should go down and when you do put the tube down, you must be very careful that you do not going into the lungs. Even with all the complications involved, I thoroughly enjoyed my rehabilitating. Learning the different behaviors of the animals was the most beneficial experience for me because it is something I have always wanted to study. It was important to not walk under the vultures or they would regurgitate on you. The foxes where trained to respond to whistles and I was asked to implement commands for the otters and raccoons.