The Thick-billed Euphonia (Euphonia laniirostris) is a finch found in Central and South America; specifically the following countries:
Bolivia, Brazil, Colombia, Costa Rica, Ecuador, Panama, Peru and Venezuela.
It inhabits shrubby areas and forest edges in lowlands to lower foothills.
- Euphonia laniirostris crassirostris
- Euphonia laniirostris melanura
- Euphonia laniirostris hypoxantha
- Euphonia laniirostris zopholega
- Euphonia laniirostris laniirostris
They average 4″ or 10 cm in length (including tail). Both sexes have dark legs.
Male: Plumage is dark blue with solid yellow underparts and yellow on forecrown to the rear or eye or beyond. The head is black on the sides. In imperfect light conditions, the blue areas may also look black. As the juvenile male matures, he develops the dark head coloration before the back changes its color.
Female: Olive above, yellow below, with olive wash on breast. Thicker bill than other euphonias but hardly noticeable in the field.
- Euphonia laniirostris crassirostris: the entire crown of the male is yellow;
- Euphonia laniirostris melanura: the yellow areas of the male is a more orange color
Their primary diet consists of a variety of fruits and insects. In particular, they are known to feed on mistletoe berries. Their gut is specially adapted for mistletoe berries, which are poisonous.
These finches tend to move to places where mistletoe berries are the most abundant. They are most commonly seen in small groups foraging in their favored feeding areas.
Euphonias are known for their almost constant singing.
Their best known calls sound like “Pe-we,” “see-see,” and “beem-beem” – hence their local name, Bim-Bim.
Species Research by Sibylle Johnson
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