So, I'm trying to make a mob sorting system that uses height difference. Spiders and Creepers are fairly simple, but I'm struggling with Zombies and Skeletons. I seem to remember one of the hermits showcasing a system that used a piston to push mobs against a lantern while they were standing on something, and the height difference was just enough that Skeletons would go under, but Zombies would stay in place. I tried to find the video, but all the mob sorters I'm seeing are using the cat / dog / villager system, which I'd like to avoid since it doesn't work 100% of the time and we have a mob cap issue on the server I'm trying to run it on. Anyone know the trick or remember the video?