In the Sound Approaches fourth title, Catching the Bug, author Mark Constantine looks deep into the theory that sound and sonograms are vital in the positive identification of Siberian Chiffchaff. Ornithologist Alan Dean has responded to the Sound Approach’s take on his techniques for identifying Siberian Chiffchaffs after he perused the August 2012 issue of Birdwatch magazine. Read his thoughts, and see Arnoud B van den Berg of the Sound Approach’s feedback.