Board Thread:Breeding Questions/@comment-24500396-20140424150007/@comment-10760902-20140520033200

@Davies: Have you upgrade your breeding sactuary building to level 2? Then the chance of Wyvern will be 10%

@Skidragon: It is defined in the game code. But I always compare with the real breeding results I have gathered (I may say the data should be enough for a statistic analysis)