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| | The Number of Species of Birds, by Ernst Mayr |
 | | This involved the complete revision of many families, the results of which have been published only in part. |
 | | Nichols had the kindness to count for me the species in the following American families: Dendrocolaptidae, Furnariidae, Formicariidae, Conopophagidae, Rhinocryptidae, Cotingidae, Pipridae, Tyrannidae, Oxyruncidae, and Phytotomidae. |
 | | The principal difficulty one has to face during a count of the species of birds in the world is to decide, in the case of the many borderline forms, whether to consider them species or subspecies. |
| www.wku.edu /~smithch/biogeog/MAYR1946.htm (1136 words) |
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