So i know that shifter forms are set up where you can't get two similar forms back to back, but that got me curious as to which 2nd tier forms correspond to which 1st tier forms. I'm mainly trying to figure this out for defensive forms and below is my guess of what seems like it would go together, but I've got some definite guesses in there and a few blanks. I'd appreciate any help filling this in.

Sand Lizard -> Anaconda
Polar Bear -> Komodo dragon(?)
Tortoise -> Armadillo(?)
Hare -> Lemur
Bobcat -> Mongoose

That still leaves the crocodile and the porcupine and no idea where they fit in. Ideas?