Cave Spider

The Cave Spider is a hostile mob that was introduced in Minecraft Beta 1.8. It is a Spider with a blue re-textured skin and is more dangerous than the regular spider, but in turn they are much rarer than regular Spiders. Cave Spiders can only be found in Abandoned Mine Shafts, introduced in Beta 1.8. Cave Spiders are also smaller than regular spiders, presumably so that they can fit through the mine shafts that they spawn in, including 1 x 1 holes. Their exact size is 0.7x0.7x0.5.

Trivia

 * It was originally going to be called a "tree spider" according to Jeb, but that wouldn't make any sense due to it spawning in mine shafts.
 * In the Beta 1.8 preview, Cave Spiders were called "Poison Spiders", but "venomous spider" would be a more scientifically correct name.
 * Cobwebs don't affect Cave Spiders.
 * When exposed to sunlight, Cave Spiders do not become passive or burn, they stay hostile regardless.
 * Torching a Cave Spider monster spawner sometimes does not prevent it from spawning spiders.
 * If you kill a Cave Spider and you are still poisoned you will not die as the poison will instantly stop once you are down to only half a heart, this is good if you can finish off the mobs and wait for the poison to go away.
 * The spider was originally planned to be venomous, but was no longer venomous in the full release of 1.8.