Uranomitra franciae is a small hummingbird species found in tropical and subtropical lowland and montane forests ranging from western Venezuela through the Andes of Colombia, Ecuador, and northern Peru. It favors the edges of forests, coffee plantations, secondary growth, and occasionally gardens at elevations from around 1,300 to 6,500 feet. Although its natural range lies within the Andes, there are occasional sightings in nearby regions outside dense forest zones. The species typically remains within its elevation zone but may shift locally in response to seasonal changes in flower availability. Males have vivid metallic green plumage with whitish underparts, a straight black bill, and a deeply forked tail with darker tips. Females are less iridescent and have more white on the lower belly and tail. Individuals measure about 3.7 to 4.3 inches in length and weigh between 0.1 and 0.15 ounces.

The species is not considered endangered and is generally regarded as common to locally abundant within its range. Uranomitra franciae feeds on nectar from a wide variety of flowering plants, including native shrubs and introduced ornamental species. It also consumes small insects, which are captured in flight or picked off foliage. The species exhibits fast, darting movements and is often seen hovering at flowers or chasing intruders away from feeding areas. Breeding behavior includes males performing short aerial displays, and females independently constructing small cup-shaped nests using plant fibers and spiderwebs, usually placed on horizontal branches or vines. Nesting has been documented during both dry and rainy seasons, depending on local flowering cycles.