That's the eternal question. Of course there are two "sides in the process". One is the one who advocates and the other who opposes. Parties advocating feathering are the most common bird owners who have the fear that their bird will run away, especially if they have one of the more expensive species. The other side are those who know about birds that birds are not just pets, animal protection associations, scientists, ornithologists, etc ...
Obviously, both sides have the right, but we go a bit deeper into the problem of "crouping the feathers on the wing".
The first category, the owners who paid the bird for a hundred and a thousand euros, the nightmare represents the flight of birds out of the window, so when the parrot comes to the house some other rules apply. Logically, but ... ..
All the windows around the house are coming down, rolling shutters, closing doors, siege, various bans and restrictions until someone "cracks the film" and says he can not do that, something needs to be done because the householders do not want be pet slaves. Considering today's life time, the fastest and simplest solution is required.
This solution is most commonly the pruning of feathers on the wing. How much it is morally or not, how much it protects the bird or destroys it, is a matter for discussion. The fact is that a bird under the feathers on our wing squash an ego, become insecure in it, it begins to feel less protected, unsafe, scared. There is no more security if someone or something is attacking him to escape - flee. Such uncertainty in a bird takes a certain amount of time until she realizes that she is being protected by a person or a person who cares about her. When it is understood, things are slowly normalized and the bird becomes the one before, but always with the caution.
Winging wings also plays a role. I met some of the birds that their owners carried to the breeders where they bought a bird, to subdue feathers because they did not know it and could not, so the master subordinated the bird of feathers on both wings from the top to half the wings! The idiot !!!
Such characters should forbid any contact with birds, not breeding.
If the feathers are already cut, this is only on one wing, and only a few feathers (one has to know which one), when the bird can not get bait. It should also be known how much the pen should be subtracted to avoid bleeding. All in all the stress for the bird. It is a better solution because the bird can fly somewhat and even escape if it is in a situation where it is endangered and on the other hand it can not get bushes and climb to the heights and fly far away.
Parrots who are able to get out of the window do not do it because they want to run, but in the game, by flying by the apartment, they simply turn in that direction and at the moment out of the house. Once they come out they are scared because they are unfamiliar with the environment and then go flying until they get tired and somewhere they fall. If the parrot managed to land on the roof of the neighboring house - great, however, if he continued to fly and climb to the heights and flew a few miles away, there is a great danger that you can not see it again.
It's good if someone finds it, and through social networks it says that a parrot has been found and everything is happily finished, but if a bird flees to a wooded area, and for fear it does not want to vote, there is a great possibility that such a bird will die due to lack of water and food . Or the bird is trapped in some branches and injures during the flight and becomes easy prey to a cranky cat, fox ... Then "the goal justifies the means"! Because of such a result we can agree that trimming the feathers on one side is justified.
However, there is another side. Training a bird for "Free flight". This is the happiest solution for the bird and for the owner. First of all, we do not physically damage the bird; another, the bird gets what belongs to it "freedom"; third, we do not have to fear that the bird will fly and will not return.
Free flight is learned gradually, first inside and then outdoors. In this way, the bird knows the surroundings of the house where it is located, can fly off whenever it wants and can always be known back. The parrot in this way has almost complete freedom, is happy and feels much better than being closed. It is true that this is a job for a bird owner, but I think everyone who wants their pet well can and should take the time to stay with him to learn something rather than his bird standing as a decoration in the cage because the bird is living being.
I hope to all of you who have been in doubt, whether to trim the feathers on the wing or not, at least helped a little with the arguments for making the right decision that is best for your bird (parrot).