You mean this?
Quote "I bred African Grey parrots for many years, back at a time when wing clipping was done by rote. Thanks to mentor Phoebe Linden, however, I understood the importance of the fledging experience. In the earliest years, babies enjoyed flight for two weeks before gradual wing clipping.
As I observed the astonishing gains to them from this experience, I made sure that they flew for three to four weeks before their clip. I was witness at this point to how young parrots use flight to reach important developmental milestones. After fledging, they first work on developing flight skills – landing safely, calculating the power of flight necessary to cover a particular distance, hovering, and more.
Once able to fly with skill, they then began to use this newfound ability to explore their environment. Finally, in their fifth and sixth week of flight, they turned their attention to the use of flight to communicate with each other and to build social relationships with each other and with me.
At this point, I made a discovery that completely changed my breeding practices and thinking about the importance of flight to a companion parrot. When I performed a slight wing clip on babies who had flown for a period of six weeks, I saw that this had a devastating impact on them. Flight had truly become
who they were, and I had taken that away from them.
I had perpetrated a crime in my own ignorance and because, like so many, I had accepted without question the oft-repeated advice that companion parrots should have their wings clipped. Never again. From that point on, I quit clipping babies entirely, sending them to new homes fully flighted and trained to recall on cue."