All subspecies have a heavy yellow bill which gives the species its name.

Immature birds lack the red face and have a yellow bill.

It has a bulbous yellow bill with a black base.

It has a heavy yellow bill and a pointed black tail.

The most common combination is a chestnut shield and yellow bill.

No, he said, that was another green parakeet, with a yellow bill.

The male has a brighter yellow bill than the female.

It has a yellow bill with blue bare skin around the eyes and legs.

All of the ducks have yellow bills and large eyes.

Adults are pale grey above, with a thick yellow bill.