The thick-billed euphonia (Euphonia laniirostris ) is a species of bird in the family Fringillidae, formerly placed in the Thraupidae.
Small, compact, short-tailed finch-like bird. Usually yellow below and blue-black above with a thick bill. To identify male euphonias, focus on the crown and throat: in Thick-billed, the crown is entirely yellow and the throat is also yellow. Females are extremely difficult to separate from other euphonias, especially Yellow-crowned, but are often seen in pairs or small groups with the more distinctive males. They frequent open woodland habitats, edges and gardens. They may form foraging flocks with other species such as warblers and tanagers.
This euphonia measures 10 cm (3.9 in). The male has entirely yellow underparts from throat to vent save for a small terminal patch of white on the undertail. Upperparts are a dark blue-black except for the yellow crown patch which extends from the bill over the head to just past the eye. The female, like many euphonias, is dull olive above and yellow below.
It is found in Bolivia, Brazil, Colombia, Costa Rica, Ecuador, Panama, Peru, and Venezuela. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical moist lowland forests, and heavily degraded former forest.
