Board Thread:F/A Discussion/@comment-26199810-20180512102535/@comment-35476439-20180513141558

I personally believe the last three animals are; Megalodon, Megatherium, and Megalania. Megalosaurus is also a very likely canidate but we'll just have to wait and see what's confirmed next.

As for Megacamelus, thats a pretty obscure animal. I feel like the devs would want to add more "well-known" animals first, but hey, I'm no dev so what do I know. For all we know maybe the last 3 animals are Megacamelus, Megaraptor, and Megalograptus.