Board Thread:F/A Discussion/@comment-26199810-20180512102535/@comment-32070106-20180513152713

Actually, the devs really hate the well known ones. Megalodon is so overhyped that they'd probably put it off as far as possible. Megacamelus is an interesting and quite possible suggestion. Megalosaurus has nothing too special about it, and the devs don't really want to add another carnivore. Megaraptor... well, it could be interesting to add a large raptor, but that's iffy at best. And Megalania is such a popular suggestion that it's very possible for it to be a mega mob.

In general, the devs really like to add obscure mobs.

Note: I am NOT a dev.