Spiders

Spiders are common neutral mobs that spawn in places with a light level of 7 or low Spiders has a very unique feature which allows the mob to climb walls!

Spiders spawn in 3x3x2 space on solid blocks (centered on the middle block) at a light level of 7 or less, in groups of 4. The top blocks can be transparent, but not solid. also the spider can spawn from monster spawners found in dungeons.

In Pocket Edition, leaves can spawn spiders, provided that there are the same conditions as above

Spiders are hostile to the player and to Iron Golems as long as the light level around them is 9 or less; otherwise they won't attack unless a player attacks first. Hostile spiders will continue to chase the player even if they are exposed to well-lit locations. Conversely, a spider won't become hostile around a player when roaming in high light, but if it wanders into a moderately shaded area it will turn hostile and remain that way. If a spider sustains damage from a source other than the player, such as falling, its hostility will be reset.

piders do not turn sideways when climbing up walls and cannot climb along the tops of ceilings. If there are blocks around the top of a wall, a spider will not be able to climb to the top and will instead fall.

Spiders are not poisonous themselves however, they are immune to poison damage also it does take damage from cactus unlike most mobs do.

Spiders drop 0-2 string. If killed by a player or tamed wolf, it also has a ¹⁄₃ chance to drop a spider eye. They drop 5 experience when killed by a player or tamed wolf

There is a 1% chance of a spider spawning with a skeleton on top of it forming a spider jockey which is more dangerous as it can attack you close up and with a range weapon.