It has a moderately-sized black bill, a long tail and a mainly green plumage.

They have metallic plumage, often blue, green or purple, and lack a crest.

The female has olive green plumage and pale olive below.

Three of the four species have a mainly green plumage.

Its body has dark green plumage and yellow talons.

Their predominantly green plumage makes them hard to spot against foliage.

The small but thick orange-red bill and a white line just under the eye contrast with the mainly green plumage.

The female and the young have an entirely green plumages.

The male has a green and gold plumage as well as an erect crest.

Juveniles have green plumage, until their first red feathers appear at around the age of four months.