Wow, it's like Your explaining their nature. Very good.

Pretty good. You might consider reading the novel Raptor Red by Robert Bakker. You might like it.

This is really good, and something much more different than usually put on this site. The only constructive comment I'll make is that you can probably combine some of your short, choppy sentences into longer sentences to help it flow better. But otherwise,very vivid descriptions and nicely built tension.