Java wrote: I don't know, I guess I just feel they know what to do for themselves, other than feeding, cause they cannot just get food if none is provided.
The flaw in this logic is that once you take them out of a natural environment, you can't count on "natural" behaviors to be suited to the artificial environment. Further, parrots LEARN some of their behaviors and a hand-raised baby won't have been taught how to do things by its parents. I think it is better to count on collective experience from humans keeping birds in captivity than to assume they will automatically do the right thing.
A Senegal would never meet a conure in its natural environment. And I'm sure plenty of birds kill other birds in a wild setting. It's part of survival of the fittest and helps select for the strongest birds to procreate. Not such a bad thing if you are a wild flock, but not desirable in your home with your beloved pets.
In a wild setting, claws probably do grow longer and sharper, but they probably also get USED a whole lot more.
I also don't know how long birds tend to live in the wild. In captivity our birds are very long-lived, but I'll wager they live fast and die young out in nature. We don't want that in our homes.
Nature is red in tooth and claw... I think any more people hear the word "natural" and get this image of soothing green forest, running water, peace and ohm... just as accurate to picture animals ripping other animals to pieces.