Golden-sided Euphonia

The golden-sided euphonia is about 11 cm (4.3 in) long and weighs about 12 to 16 g (0.42 to 0.56 oz). It is a smallish euphonia with a stout bill. The species is sexually dimorphic. Adult males are almost entirely dark glossy steel-blue. Their flight feathers and tail are dusky with a steel-blue tinge and steel-blue feather edges. A patch of elongated golden-yellow pectoral feathers that protrude in front of the wing give the species its English name. Adult females have a yellowish forehead and face, an olive crown and nape, and olive upperparts, wings, and tail. Voice: The golden-sided euphonia's call is "a low, harsh, and gravelly j’a’a’a’a repeated 2–6 times, sometimes quickly. gives longer, faster, and buzzy rattle, bjjjjjjjjjjjjjjjjjjj, c. 2 seconds, and nasal ruee-e-et". Observers have also reported a duet of short flat whistles and other notes.