The drongo gives false alarm calls to scare other animals off their food. Dream books read it as trickery, cleverness and a warning that may not be what it seems.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.