High Quality Content by WIKIPEDIA articles! The Swallow-tailed Hummingbird (Eupetomena macroura) is a species in the hummingbird family (Trochilidae), found mainly in east-central South America. Most authorities place it in the monotypic genus Eupetomena, although some place it in Campylopterus based on song and the thick shafts of the males` first primaries. Its common name and specific epithet (which means "large-tailed") both refer to the long, deeply forked, somewhat swallow-like tail.