Golden-rumped Euphonia

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Quick Facts

  • Scientific Name: Euphonia cyanocephala
  • Spanish Name: Eufonia de lomo dorado
  • Family: Fringillidae
  • Known Nicknames: Golden-rumped Tanager, Yellow-rumped Euphonia
  • Average Length: 10–11 cm / 3.9–4.3 in
  • Average Weight: 12–16 g / 0.42–0.56 oz
  • Wingspan: N/A
  • Key Feature: Bright yellow rump and underparts contrasting with blue-black upperparts and crown
  • Primary Diet: Primarily Frugivore (especially mistletoe berries)
  • Range: South America: Colombia, Venezuela, Trinidad, Guyana, Suriname, French Guiana, Brazil, Ecuador, Peru, Bolivia, and northern Argentina
  • Habitat: Tropical and subtropical moist lowland forests, forest edges, and secondary growth
  • Social Structure: Social (often seen in pairs or small flocks)
  • Nesting/Breeding: Domed nest built in tree forks or among epiphytes
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Golden-rumped Euphonia (*Euphonia cyanocephala*) is a dazzling little finch-like bird native to South America, particularly the Amazon basin and the Guianas, where it flits through humid forests and woodlands. Its most striking feature is the namesake bright golden-yellow rump and underparts, which contrast sharply with a deep, glossy blue-black head, throat, and wings in the male, while females are more subtly olive-green above with a yellow belly and a distinct blue cap. A special characteristic is its thick, stubby bill, perfectly adapted for plucking mistletoe berries, which form the bulk of its diet and make it a key seed disperser for these parasitic plants. Adding to its charm, this euphonia often travels in small, noisy flocks, producing a series of clear, whistled notes that announce its presence among the canopy.

Fun Facts

Despite its name, the male’s “golden” rump is actually a vivid, almost neon yellow that seems to glow in low light, a trick achieved by microscopic feather structures that scatter light rather than by pigment alone. They are accomplished mimics, often incorporating the calls of other birds—like tanagers and hawks—into their own complex songs, possibly to confuse rivals or attract mates. A quirky social behavior is their fondness for "anting": they will pick up ants and rub them through their feathers, using the formic acid as a natural insecticide and fungicide. Finally, they have a specialized gizzard that allows them to digest the waxy, nutrient-poor fruits of mistletoe, a food source most other birds avoid, making them key dispersers of this parasitic plant.

Habitats & Distribution

The Golden-rumped Euphonia inhabits subtropical or tropical moist montane forests, as well as heavily degraded former forest areas and forest edges. It is particularly associated with humid highland forests and cloud forests, often frequenting the canopy and mid-story where it forages for mistletoe berries. Its geographical range is restricted to the northern Andes, occurring in western and northern Venezuela, Colombia, and Ecuador, with isolated populations also found in the Sierra Nevada de Santa Marta and the Perijá Mountains.

Behaviours & Reproduction

The Golden-rumped Euphonia is generally observed in pairs or small family groups, suggesting a monogamous social structure. Mating habits involve the male performing a courtship display that includes puffing its yellow underparts and singing from a prominent perch. The species builds a domed nest with a side entrance, often constructed in a concealed location such as moss or epiphytes. A unique reproductive strategy is that both parents share incubation duties and feed the young, which is relatively uncommon among passerines where females typically handle incubation alone. The female lays a clutch of 2-4 eggs, and the pair may raise multiple broods in a single breeding season if conditions are favorable.

Diet

The Golden-rumped Euphonia is primarily a frugivore, with its diet heavily centered on small, soft fruits, particularly those from mistletoe plants (Loranthaceae family), which form the cornerstone of its nutrition. It uses its short, thick bill to pluck berries directly from branches, and an interesting fact is that it plays a crucial ecological role as a seed disperser for these parasitic plants, often digesting the fruit’s pulp while passing the sticky seeds intact. Additionally, it supplements its fruit-based diet with occasional small insects, spiders, and other arthropods, especially during the breeding season when higher protein intake is needed for chick development.

Colors

The male Golden-rumped Euphonia has a bright yellow throat, breast, and rump, contrasting with a deep metallic blue head, wings, and tail. The female is olive-green above with a yellow belly and grayish throat, lacking the male’s vivid blue. Both sexes have a short, thick bill and no camouflage adaptations, as their bright colors serve for social signaling rather than concealment.

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