Ah... [He looks down at the floor, the towel resting around his shoulders.] It's... a weak spot for us. Since it's connected to our spines it'd be really easy to hurt us if someone were to grab it and inflict a lot of damage. [the gist of it, anyways.

He picks up his tail, running the fur through his hand.] Those of us who are smart enough know better than to show off our weakness like that where others can see it.