Build a shelter

At this size, you know you'll need a safe area to collect your thoughts. So you start digging a shelter into a nearby dirt block. By the end of the day, you've created a small dirt home for yourself, and got a couple of building blocks as well. Though the sun's setting fast, and you don't want to be outside when the mobs come out. So you enter your shelter, and block off the door. The footsteps of the mobs outside send shockwaves through your tiny home. If it weren't for Minecraft physics, you're sure it would have collapsed by now. Though something's off, the mobs sound more high pitched than usual. You remove a dirt block, and peer outside. When you look, you discover that the mobs are, monster girls? A zombie steps right outside of your base, knocking you off of your feet. It might be a good idea to hole off your shelter, but you're curious now. Just what is going on with the mobs?