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Are Birds Really Dinosaurs? - http://www.ucmp.berkeley.edu/diapsids/avians.html
A DinoBuzz article covering the theory, and objections towards it, of the dinosaurian origin of birds. |
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Genera and Species of Paleocene Birds - http://www.paleocene-mammals.de/pal_birds.htm
Provides details of the bird genera of this epoch that have been classified from their fossil record. |
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Phorusrhacos - http://www.abc.net.au/beasts/factfiles/factfiles/phorusrhacos.htm
Partial fossils of this bird have been found in Argentina dating back to 27 million years ago. |
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BBC Science and Nature: Gastornis - http://www.bbc.co.uk/nature/wildfacts/factfiles/435.shtml
Provides an illustration and information on this fearsome bird, its description, distribution, behavior and history. |