when working birds I find myself asking this question allot obviosly if I see or hear the moving off I will move to another location hope fully in their travel path but when all is quiet, the bird is hung up,the bird shuts up, did I spook him? did someone or something else spook them? I like to show patience here soft clucks, purrs, and leaf scraping and just silence how long does everyone wait before moving? any other tips?