Now, now, it's not what you think. I'm making this topic so we can make our bets on which animal that some of soon-to-be-seen biju are going to be... And some of them are already known since some of them don't have other variations.
We already know that:
Sanbi- ...Turtle/Shellfish [Though I wouldn't call it that]
Yonbi- Cockatrice (Mix of rooster and reptile) [I doubt it'll be this, I mean come on, there's a giant rooster wreaking havoc all over a country? I think not.]
One we don't know or think otherwise [At least I think otherwise]:
Yonbi- I hope it more reptilian. You kno the reason if you read my thoughts on it.
Gobi- I'd find it more appropriate for it to be a wolf. It'll look too friend if it's just a dog.
Rokubi- A monkey, since the other forms it COULD be is a cat, tanuki, or monkey. With the cat and the tanuki being a biju, the badger seems like the only one left, but you'll see why I didn't choose it.
Shichibi- The badger, It's an earth element which uses clay as well. Deidara, anyone?