User blog comment:Zathronas/Analysis by an author: Volume 2 episode 9: Search and Destroy/@comment-10380701-20141003025940/@comment-9090085-20141003034912

Dinosaurs to go with our "mammoths"? A regular prehistoric tour, that. I like it.

You know, that look the Goliath gave Ruby shows us some of that intelligence - It knows she's there, and it chooses to ignore her. Unlike the Beowolves, who attacked on sight. Hence why it's chilling.

It's a scary thing you know; any Grimm that learns not to attack humans on sight will essentially be ignored by humanity, allowing it to grow and grow, indefinitely, waiting and waiting, for the perfect moment to strike and wipe out the kingdoms in one fell swoop.