User blog comment:The Reptile King/The Reptile Kingdom/@comment-27950421-20160531191408/@comment-28530195-20160601060347

What about a Mosa rival? you could use a Dolichorhynchops: They're dolphin-like plesiosaurs. Here's For how they could be a rival: they could be pack hunters and be able to wear down the average Mosa with pure numbers. I think it could work....