A very interesting article on a very sensitive subject.
Some keepers attitude and practices in wing/feather clipping incense me. As far as I am concerned these people demonstrate ignorance and selfishness beyond belief and should be outlawed.
Other than veterinary recommended clipping for health issues and in the interest of the bird, where there is no other available course of cure, there is absolutely no need at all to interfere with a birds wings. It's bad enough that too many birds, particularly pets, have very restricted opportunity to fly anyway, amongst other numerous man imposed cruel restrictions.
Clearly people that clip to control a bird haven't got the inclination to provide proper care and therefore shouldn't have the poor bird in the first place.
If only people educated themselves first!