Author 'Francis-Sisco' (Id 245918 ) : The female looks much like the yellow warbler or warbler cap black, but its white belly aid to its identification. She does not wear a mask as the male. It has the front and sides of the head olive-coloured. It also brings an eyebrow, and a circle eye white, which is sometimes difficult to see. Lien : Https://fr.wikipedia.org/wiki/Paruline_masqu%C3%A9e