Among the nine species of lovebirds, three species are dimorphic. This means that the males of these species have visible color differences from the females. The three species of lovebirds that fall into this category are the Madagascar lovebird, the red-faced lovebird and the Abyssinian lovebird.
The Madagascar lovebird is also known as the gray-headed lovebird. The head, breast and back of the neck on male birds will be gray against an otherwise green body, which gets darker on the back and wings. Females of this species are completely green.
Male red-faced lovebirds are bright green with yellow coloration on their breasts and undersides. Males have orange-red faces and crowns with green and black wings. Females have faces that are more orange than red; their wings are entirely green.
The Abyssinian lovebird may also be called the black-winged lovebird. Males of this species are green with bright red coloration on their foreheads and surrounding their eyes. The areas under the wings are black on males. Females do not have any red on their heads, and the areas under their wings tend to be more greenish, though they may contain some black.