You know what may also be VERY interesting about the pic you just posted. I never noticed it before but that certainly LOOKS like pieces to an alien city (or at least a different city) with a tower over the monsters left shoulder, the spiked wall behind the monster and the housing structure to the far right of the pic. Interesting.
They're new in that planet so I assume that there's going to be other intelligent species living there.
No doubt, but I was listening to a rewind theatre by IGN (I think), where they look at games to see if they can pick things out we didn't know about. In the last one they were questioning if there was going to be any more cities in the game. It had me wondering too, and this definitely clears it up.
On a side note, it's a bad sign that the monster appears to be INSIDE the city limits, lol.