Du Val, E. H. 2000 Journal 7 April 2000 Isla Boca Brava, Chiriqui Prov., Panama Notes on display: Slow flight is performed by one or two birds - usually two after a QR bout & before or after dancing; by one bird after the partner leaves & the remaining male is finishing the courtship. Males fly with neck outstretched, head slightly down, and crown flared, fluttering laboriously between perches and frequently passing close to the female. Male(s) often give a "pip" call when landing and quickly leave the perch they have arrived at. In dual display, the first male usually "pip's" on arrival, and both give a coordinated down-whistle when the second male lands nearby. In solo slow flight today (at well) I observed for the first time a rattling noise that was only sometimes heard as the male passed the female. (Other passes were silent). It was the faint fast click of a bat hunting or a heliconia bowing in the wind. Perhaps this is one of the mechanical mating sounds?