I will talk about an interesting topic. How many mobs can be in a single block? Today, i waited near a double cave spider spawner for
2 hours. When i came back to my keyboard, there were a lot of spiders. There are some screenshots:
In this pic, spiders come out from a hole(it is a glitch they come out and then return) exactly like a fountain, they come come and come.
In this pic, they are in a single block, all have only a half heart life.(Xp farm)
It took 5-10 mins to kill all even if they had one hit kill lifes and my level was 48 after killing them(from 30). There were 509 cave spiders(calculated). Just post your screenshots here if you had more and let's see how many mobs can be in a single place