else is known about its breeding biology. Vocalization The nominate subspecies of band-rumped swift "gives a diagnostic bisyllabic 'pseee-trr' or more burry 'prrrree-trtr'" and sometimes also "several repeated notes 'tsee-tsee-tsee'". The vocalizations of subspecies C. s. aetherodroma are not well known. Status The IUCN has assessed the band-rumped swift as being of Least Concern. It has a very large range and an estimated population of at least 500,000 mature individuals. The population is believed to be slowly decreasing. No immediate threats have been identified. It is considered uncommon to common in Ecuador and common to abundant in most of the rest of its range. It occurs in many protected areas. References band-rumped swift Birds of Panama Birds of Colombia Birds of Ecuador Birds of Venezuela Birds of Trinidad and Tobago Birds of the Amazon Basin band-rumped swift Birds of Brazil