I have always assumed that one of the reasons for the evolution of at least some large flightless birds was lack of competition from mammals. This seems highly likely for moas, elephant-birds, giant flightless Hawaiian geese, large flightless galliforms on New Caledonia and Fiji, dodos etc. it may be have been less of a factor for large birds on continents, but I wonder if the evolution of large size early giant birds such as Gastornis might have been facilitated by a depauperate mammal fauna after the C-T?
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On Oct 13, 2017, at 7:47 PM, John Bois <email@example.com> wrote: