51³Ô¹ÏÍø

It measures 13 centimeters long and weighs 7 grams, with a 3 centimeter beak. It is robust, with a long and curved beak, with a light yellow mandible and a black jaw. Upperparts tan green; darkened post-ocular stripe and narrow white superciliary stripe; rusty lower parts, being more intense in the throat and upper chest. Brown rectrices with a wide black subterminal stripe and a white tip, the central ones being green and not elongated. The female is lighter ventrally and has a more curved bill than the male. Perched, or even hovering in flight, it can be seen insistently waving its tail back and forth, living up to its main popular name.