Small finchlike bird, compact and short-tailed. Generally yellow below and dark blue-black above with stout bill. To identify male euphonias, focus on crown and throat: on Thick-billed, the crown is entirely yellow, and throat is yellow. Females are challenging to separate from other euphonias, especially Yellow-crowned, but often seen in pairs or small groups with more distinctive males. Frequents open forested habitats, edges, and gardens. Can form mixed feeding flocks with other species such as warblers and tanagers.