I was very surprised Snickers fit in so quickly. I knew my b&g macaw, amazon and my cockatiel fit in quickly. Sami (macaw) had a couple macaws flying over to land next to her & sidling up close to her on the perch -- within 30 minutes of her arrival. (At first, she clung on enclosure wire side, just watching/looking for me). I was there for their sanctuary placement and got to see them settle in a little. Kodak (cockatiel) had several girlfriends and perch cuddlers before I left that day. And Lukaya (YNA) also fit in quickly. But wow -- amazons are more boisterous -- it went smoother than it looked! I seriously thought Lukaya might have to fight them all to find a place there -- but there was no fighting -- just a lot of racket, screeching whistles, crazy eyes pinning and blurry fly-bys! She fit right in! lol
I really thought greys would be slower to adapt since they're more reserved, nervous & shy (well, my Snickers is like that anyway). I have considered that since Snickers was placed in with other greys -- other greys with probably similar backgrounds -- greys who had also been through a 'first day at the sanctuary experience' - well... perhaps those greys are now very experienced in greeting new arrivals. A new grey must have interested them greatly. I suppose if just one or two greys there approached Snickers respectfully, and showed friendly interest, he would naturally reciprocate. If Snickers felt abandoned by me, friendly greys approaching him may have been quite a relief to him. And Snickers no doubt learned the sanctuary routine from them -- when fresh food is put out, which perches are most sheltered for sleeping, which toys are the best, etc.. I don't know. Just guessing. Thankful that whatever happened for him, happened.
So I guess greys can read other greys. Even greys kept in private homes for decades.