Many subspecies...may
               sometimes imitate the calls of
               other birds such as drongos.
          
         
            
               Aegithina tiphia
            
               (L 4.7-5.7")
          
         
         
            
               During the breeding season, males
               display by fluffing up their feathers and
               spiral in the air appearing like a green,
               black, yellow and white ball.
            
               (Wikipedia)
          
         
         
            
               Aegintha is a mythical bird
               mentioned by Aristotle, Pliny and
               others; Iora is a feminine name
               meaning
a birdlike woman.
            
               
               (http://www.allbabynames.net/iora/)