Spider

Spiders are Neutral Mobs that were added in 0.3.3. They are two blocks wide and one block tall. They are hostile at night and neutral in the daytime unless attacked first by the player.

Spawn
Spiders spawn in light levels of under 7 naturally from Leaves or any dark places (E.g: Caves, etc.). They can also be spawned through Monster Spawners, or Spawn Eggs.

Offense
Spiders attack by jumping on the player, and can climb over all blocks, even fences. They move fast. They deal 2-3 heath points of damage per hit, making them dangerous in groups. They attack by running up to the player and jumping at them, or they jump on them from above.

Defense
A Bow works best, as with most hostile mobs, but a Sword works as well. Since Spiders only have 16 health points, they are relatively easy to kill. Even a wooden sword can kill a spider in 4 hits.

Trivia

 * Spiders used to be the only neutral mobs in the game till Update 0.9.0.
 * Spiders don't burn in daylight.
 * Spiders have glowing eyes since Update 0.7.3.
 * Spiders are one of the mobs that have to jump at the player to attack and that makes it sometimes hard to avoid if the player is running from the spider.
 * Spider farms are difficult to make since they can climb fences and fit in small spaces.
 * Spiders have a variant, Cave Spiders, which are smaller and only spawn in Abandoned Mineshafts.
 * Before Update 0.11.0, Spider Spawners were inside Abandoned Mineshafts and not Cave Spider Spawners.
 * Spiders are immune to Poison Status Effect.
 * Spider Jockeys, which is a skeleton riding a spider, spawn very rarely.
 * After Update 0.12.1, Spiders drop Spider Eyes.

Araña