Board Thread:Speculation House/@comment-25045079-20141009014812/@comment-9090085-20141026053216

Mercen-X wrote: Generally, two-limbed lizards are serpent-like belly-crawlers. The only creature to walk "upright" would be the moa, a type of bird creature.

Ah yes, the moa, the only wingless birds known to mankind, all extinct. And these Grimm look nothing like them. They have a lizard-like tail and head, and their legs are positioned like arms would be on a person, a little like the Gaga mobile suit.

And having actually looked at a shrieker from tremors, I can definitely see the resemblance.