Cuculiformes
The
near passerine bird order
Cuculiformes traditionally included three families as below:
However, the taxonomy of this group is now controversial.
Sibley-Ahlquist taxonomy raises the Musophagidae to an order Musophagiformes, and the
Hoatzin continues to be enigmatic. Although the
DNA evidence places it with the Cuculiformes, it has structural features inconsistent with that group.