From Opus

Aves (all birds)

[edit] Description

[edit] Taxonomy

Recent fossil finds make it highly likely that the closest relatives of birds were the dinosaurs.

Below is a list of all the orders in the class Aves that are recognized by Opus, which at this level of taxonomy follows the Clements Checklist of Birds of the World. If you are looking for an order that you cannot find in this list, there may be a link to it at the end of this page; in the linked page you should find the families associated with that order as well as a link to the order under which those families are currently listed in Opus.