Board Thread:News and Announcements/@comment-25868382-20150425035113/@comment-4630033-20150525034558

I can't get any as I'm now a fully fledged PC player, but I have a theory on why the Rare Drumpler's chances are so shaky - it has one of the shortest breeding times (same as the Rare Fwog, with the Rare Maw slightly longer) of all rares, meaning more attempts can be made. This means there would be more Rare Drumplers if the chances were equal.

Further proof (maybe) would be based on the Rare Riff - as it is a quad rare, it takes more time, meaning less attempts. But as Kookers said, it seems like the Rare Riff's chances were upped due to this.