Parallel drainage pattern. A parallel drainage system is a pattern of rivers caused by steep slopes with some relief. Because of the steep slopes, the streams are swift and straight, with very few tributaries, and all flow in the same direction.
1 In Creative, the player can use spawn eggs to spawn most mobs. 2  When mobs are spawned this way, all normal spawning requirements, such as light level and block type, are ignored. 3  Any entity can be spawned using the /summon command.
They are NOT vanilla minecraft mobs, they come with a mod. unless you want to get rid of all hostile mobs or are a pretty good programmer, no. the only way in vanilla minecraft to remove specific mobs is to delete there coding or remove the code that makes them spawn.