It is one of five species of the genus "Pharomachrus" known as quetzals. The calls of the quetzals and the two Caribbean genera are the most complex. Most female quetzals have no ornamentation and are drab. The family Trogonidae includes trogons and quetzals. Some species, particularly the quetzals, are adapted to cooler montane forest. Resplendent quetzals usually live alone when not breeding. The family Trogonidae includes the trogons and quetzals. Resplendent quetzals have other unmusical calls as well.