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.
Zombies are sometimes considered the least dangerous hostile mob in the game because they are slow and can only use close-range melee attacks. However, it is possible for several zombies to collaborate and attack as a team, making them more difficult to overcome. Zombies can spawn in two slightly different appearances.