Южная ласточка Progne elegans

Large swallow with pointed wings and slightly forked tail. Males are deep iridescent purple; females are also entirely dark, but are brownish below, with faint scaling. Migrates within South America; at some times of year, occurs with other very similar martin species, making identification difficult. Females lack the light belly of similar Purple and Gray-breasted Martins; males essentially indistinguishable from Purple Martin.