The Green-fronted Lancebill is a greenish cloud forest hummingbird notable for its long, very straight bill that is slightly upturned near the tip. It feeds on the nectar of long, tubular flowers by hovering beneath them and probing upward, and typically "trap-lines" amongst favored plants. Its nest is often placed under an overhang or root along a stream or ledge, and is constructed of moss and treefern scales held together with cobwebs and other fibers. It occurs in Costa Rica and Panama as well as in the Andes from Venezuela south to Bolivia. It is distinguished from the partly sympatric Blue-fronted Lancebill (D. johannae) by its bright green (rather than blue) forecrown and preference for higher elevations.