By the way, who knows where I can get an electronic (pdf) copy of the Brisson's 1760 Ornithologia?
I've got volumes 2, 4, 5 and 6 at French National Library website (gallica.bnf.fr). But what I need is the volume 1...
Thank you in advance,
Roberto Takata
In any case, not quite. Flight capabilities of galliforms for example are not too well-developed, but also very rarely lost (not quite as rarely as in passeriforms, but far more rarely than in the usually well-flying Anseriformes).