Most males, but only 10% of females, have a hooked upper mandible.

The upper mandible is black and the lower red.

The bill is short with a sharp, hooked tip to the upper mandible.

Unlike in most birds, the tip of the bill's upper mandible is flexible.

The upper mandible is black with reddish areas on both sides.

The lower and upper mandibles are red with yellow tips.

The upper mandible is prominent, curves downward, and comes to a point.

Juveniles have grey on the upper mandible and are otherwise similar to adults.

The black bill is short and straight, with a slightly down-curved upper mandible.

Its bill is large and black with yellow on the upper mandible, and the tip.