Male: greenish above (rich black above, with yellowish rump, in summer breeding plumage); black wings and tail; two white wing-bars; bright yellow  underbody. Female: yellow-green plumage; white wingbars; greenish-brown wings. Pairs keep to leafy branches, often with other small birds; moves energetically amidst branches in hunt for insects, caterpillars; rich call notes often a giveaway of its presence in an area.