Originally posted by TheBoot:

Those are some hefty earthen walls!
I wonder if the game treats non-aggressive animals different than "enemies"?

Well this was my first large base when I was new to the game. When I got troll raids I raised the berm. That wasn't good enough because the trolls could see over it and they threw rocks and damaged structures, killed livestock, and destroyed crops. So I added the moat with a core wood beam across it at each gate, built a barn instead of just a pen for the live stock so the trolls couldn't see them, and raised a stone wall around the crop beds so the trolls couldn't see those either.

Nothing else spawns at that point just a single deer on rare occasions. Once I finished the defenses nothing that walked got in from the outside. If we got a ground is shaking event and ignored it nothing happened but when the event despawned there would always be one or 2 trolls waiting outside for us and if it was a Foul smell that we ignored there were always 6 or 7 skeletons and as many as 12 Dragur waiting for us when we exited from one of the gates. There is another deer spawn point and a grayling spawn point just outside the moat that is also outside work bench range and occasionally we can pick up deer meat, hide, wood and resin because the raid killed the stuff that was outside.