User blog comment:BannedLagiacrus/Leviathan Discussion/@comment-5963861-20170108013539/@comment-20010297-20170109150936

It does make no sense. Pokaradon is the only Mammal Leviathan, while all the others are Reptilian Wyverns.

As for Seregios, he's not Bird-like enough. Too scaly, no bird-beak, absolutely no feathers, tends to move more like a Pseudowyvern than a Bird Wyvern.