Love the initial quote. The text is akward to read in spots. (I have only seen it since the wall of text has been broken).
Conceptually it is good. This post seems to be missing the answers to some basic questions and some immediate ones.
Where abouts do these monsters live? Do they attack other things than people? (I mean then why aren't the cities full of these things?)
How do we know about them killing things? Perhaps description of the wounds? (and the result of an implied large claw)
The pack size means a lot of food that can hear them.
Sonar? They are stealthy, but can be heard.
They also seem to possess some form of intelligence as they appear to communicate with each other, (replace the comma with a period).
If we can't percieve them, how do we know there are others (or groups)? How do we know they seem to be intelligent? How do we know they communicate with each other?
Good concept. Execution just needs some umphGo to Comment