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| | Bird - Open Encyclopedia (Site not responding. Last check: 2007-11-06) |
 | | Other early birds now extinct include the Confuciusornithidae, Enantiornithes, Ichthyornis, and Hesperornithiformes, a group of flightless divers resembling grebes. |
 | | The flightless Palaeognaths, the Ostrich group, were first to diverge from the avian lineage, and it is now thought that the basal divergence from the remaining Neognathes was that of the Galloanseri, the superorder containing the Anseriformes (ducks, geese and swans), and the Galliformes (the pheasants, grouse and their allies). |
 | | Sibley and Ahlquist's Phylogeny and Classification of Birds (1990) is a landmark work on the classification of birds (although frequently debated and constantly revised). |
| open-encyclopedia.com /Bird (2085 words) |
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