Purple-collared Woodstar

The purple-collared woodstar is 7.5 to 8 cm (3.0 to 3.1 in) long and weighs 2.3 to 2.5 g (0.081 to 0.088 oz). Both sexes have a short, decurved, black bill. Their upperparts are bronze-green. Males have an iridescent aquamarine gorget with a shiny violet band below it. The rest of the underparts are dirty white. The long forked tail is dusky brown glossed with light green. The female's underparts are buff, with a bit of white on the throat and belly. Voice: The male purple-collared woodstar makes "a series of twittering 'ti-ti-ti-trl' phrases" at the top of its courtship flight, and at the bottom (mechanically) makes "a remarkable, nasal-sounding 'anh-anh-anh-anh-anh'". In a chase it makes "a fast, high-pitched, descending twittering 'ti-ti-ti-ti'", and another call is "a fast dry 'chi-chi-chi'".