I got one off of an Aviak Twice in one night, one was an Avocet, the other a Harrier. Been hunting aviaks for several levels now and have seen them drop off of rooks and up there. I'll be saving them from now on for future refrence. ;) BTW, the birds drop pearls, aquamarine, topaz, and all kinds of other gems rare and common. have fun.
Myyrlin Treewhisper 20th Druid of Tunare Tribunal Server