The White-necked Jacobin (Florisuga mellivora) resides from south Mexico to west Ecuador, Bolivia and Amazonian Brazil. It frequents mostly forest canopy or treetops in semi-open, and often lower at edges, clearings, and in second growth. Its size is of 12 cm (4 inches) in height and 7 g in weight.
Its head, neck, and throat are deep blue. Rest of upperparts and central retrices are bright green. Nape and belly white. Bill and feet black. Both sexes visit trees flowers, epiphytes, and Heliconia.