Birds have a different way of making it happen and it isn't quite "mounting". They just sort of touch cloacas. Unlike male snakes and lizards which have two, male crocs which have one, male birds have no external apparatus to couple with so there really isn't a classic mounting so to speak.
CMIIW, but isn't this only true for neoavians? I had thought that male galliforms like turkeys (and paleognathes and anseriforms) were, um, still all man. (Which of course suggests the same for other non-neoavian dinosaurs.) -- T. Michael Keesey The Dinosauricon: http://dino.lm.com Parry & Carney: http://parryandcarney.com ISPN Forum: http://www.phylonames.org/forum/