vocalizations

Hi, I have a GCC chick, 4.5 weeks old. He is starting to take less at each feeding (fed 4X/day). He has a strong feeding response initially (bobbing), mouths occasionally (like swallowing/tonguing like adult, which I've read is normal in slow hand-fed birds), then after about 5-7 cc's, usually...

This is going to seem like an impossibility, but I am going to ask these questions anyways. 1. Has anyone ever made a very strong attempt to control the audible environment around their new developing bird in an attempt to train only very specific phrases, whistles, clicks, etc. and has anyone...

What do these sounds mean? I can't really find any information about the vocalization of caiques so I'd like to find out. It he happy, interested, scared? I can't tell. He's just looking out the window. In the first video he saw a bird go by.