White-necked Jacobin

km18 Valle Del Cauca Colombia

Quick Facts

  • Scientific Name: Florisuga mellivora
  • Spanish Name: Jacobino nuquiblanco
  • Family: Trochilidae
  • Known Nicknames: White-necked Jacobin, Great Jacobin, Collared Hummingbird
  • Average Length: 11–12 cm / 4.3–4.7 in
  • Average Weight: 6–8 g / 0.21–0.28 oz
  • Wingspan: N/A
  • Key Feature: White nape and upper back contrasting with dark blue head and green body
  • Primary Diet: Primarily Nectarivore
  • Range: Southern Mexico to northern Bolivia, central Brazil, and Trinidad
  • Habitat: Lowland and foothill tropical rainforest, forest edges, and clearings
  • Social Structure: Solitary, but may congregate at rich food sources
  • Nesting/Breeding: Small cup nest on a horizontal tree branch
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The White-necked Jacobin (*Florisuga mellivora*) is a dazzling hummingbird found from southern Mexico to the Amazon basin, renowned for its striking iridescent plumage and unique, almost scaly-looking throat. The male is particularly eye-catching, with a brilliant white belly and a broad, white crescent on the nape that contrasts sharply with its deep, metallic blue head and chest, while the back and tail shimmer with emerald and turquoise hues. A special feature is its relatively large, forked tail, which it fans out during display, and unlike many hummingbirds, the male lacks a colorful gorget, instead showcasing a smooth, glossy blue bib. Females and juveniles are more cryptic, with green upperparts and white-spotted underparts, but share the species’ characteristic rapid, bee-like flight and a loud, chattering call that echoes through the forest canopy.

Fun Facts

Despite its flashy iridescent blue hood and white nape, the white-necked jacobin is a notorious bully at nectar feeders, aggressively chasing away much larger hummingbirds and even butterflies with rapid-fire chattering calls. It has a unique, almost lazy feeding style where it often clings sideways to flowers or perches to drink, rather than hovering constantly. Males perform a spectacular aerial display called a “pendulum flight,” swinging back and forth in a deep U-shape while producing a loud, metallic *zing* sound with their tail feathers. Remarkably, this species is one of the few hummingbirds known to occasionally eat small spiders and insects by gleaning them directly from spiderwebs, not just catching them in midair.

Habitats & Distribution

The White-necked Jacobin inhabits a variety of humid and semi-humid lowland environments, primarily tropical rainforests, forest edges, clearings, and secondary growth. It is also commonly found in plantations, gardens, and along rivers where flowering trees are abundant, often ranging from sea level up to around 1,500 meters in elevation. Its geographical range extends from southern Mexico through Central America and into much of South America, including Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, and Brazil, as well as Trinidad and Tobago. It is generally resident throughout this large area, though some local seasonal movements may occur in response to flowering cycles.

Behaviours & Reproduction

The White-necked Jacobin is a solitary and highly territorial hummingbird, especially during breeding. Males establish and aggressively defend feeding territories rich in nectar flowers, which they use to attract females through aerial displays and vocalizations. There is no pair bond; after mating, the male takes no part in nesting or parental care. The female alone builds a small cup-shaped nest from plant fibers, spiderwebs, and lichen, typically on a horizontal branch over water or in a tree fork. She lays two white eggs and incubates them for about 15–18 days. A unique reproductive strategy is that females may lay eggs in the nests of other hummingbird species (brood parasitism), though this is rare and not fully understood. The chicks are altricial, fed by the female on regurgitated nectar and insects, and fledge in around 20–26 days.

Diet

The White-necked Jacobin is a specialized nectarivore, with its diet consisting almost entirely of nectar from a variety of brightly colored, tubular flowers, particularly those of the Heliconia, Costus, and Aphelandra genera, which it accesses using its long, extendable tongue. An interesting fact about its feeding behavior is that it is a classic "trap-line" forager, meaning it will repeatedly visit a specific circuit of flowers in a set sequence throughout the day to maximize energy intake. Furthermore, unlike many hummingbirds that are highly territorial, the White-necked Jacobin often feeds in the forest canopy and is known to be a "hermit" type, frequently foraging alone and following army ant swarms to catch small insects and spiders as a crucial source of protein, especially during the breeding season.

Colors

The White-necked Jacobin has a striking, iridescent blue head and upper chest, sharply contrasting with a pure white lower belly and a distinctive white crescent-shaped patch on the nape. Its back is a shimmering bronze-green, while the tail is dark, forked, and edged with white tips. Males have a solid blue hood, whereas females are duller with scaled green underparts and a blue-spotted throat, providing camouflage in dappled forest light.