Holy ^%$@#! These are phenomenal! Not that i'm susrprised that you would master something as impossible as bird photography, but that ANYONE has the patience for that kind of shooting - so it's cool that I know someone who does.
Great detail, great saturation, and you've really got the composition down! Now, how the heck do you get them to look so realxed and natural - I have some models that could use a tip. Maybe it's the feathers!