The Sibley-Monroe checklist 6 reference article from the English Wikipedia on 24-Apr-2004
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Sibley-Monroe checklist 6

Helping orphans the way you would do it
The Sibley-Monroe checklist was a landmark document in the study of birds. It drew on extensive DNA-DNA hybridisation studies to reassess the relationships between modern birds.

Table of contents
1 Strigiformes
2 Columbiformes

Strigiformes

Tytonidae

Strigidae

Aegothelidae

Podargidae

Batrachostomidae

Steatornithidae

Nyctibiidae

Eurostopodidae

Caprimulgidae

Columbiformes

Raphidae

Columbidae

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