 Though there is a peak of singing activity near dawn, chingolos will sing strongly, if not persistently, at almost any time of day during the main season (September to January), except when mid-day temperatures are much above .There is a slight resurgence of activity in the evening.In some areas (in arid parts of north-west Argentina, in eastern Patagonia, and in certain sites in Costa Rica) there is often or always no terminal trill, and the song comprises whistles only.