Spider Jockey

Spider Jockey is a rare mob that appears as a spider being ridden by a skeleton. It is not actually a separate mob, as both the mobs take individual damage. They were added in Update 0.11.0.

Spawn
Spider Jockeys have a very low chance to spawn, with every Spider having 1% chance to be a spider jockey. The process can be made faster using a Monster Spawner or Spawn Eggs. There is a chance it can be a Cave Spider Jockey.

Trivia

 * The Spider controls the Jockey's movement. Thus, it may not attack during the day.
 * The Skeleton may still shoot the player.
 * It is possible for the Skeleton to suffocate as the Spider can go through 1 block tall spaces but Skeletons cannot, and will take suffocation damage.
 * If the jockey enters water, then the skeleton may jump off the spider.
 * Version Exclusive: There is a Cave Spider Jockey in MCPE.
 * The Cave Spider Jockey is more dangerous, because when the player is hit by an arrow from the Skeleton, they may also be poisoned by the Cave Spider.
 * A variant of spider jockeys called "Wither Jockeys" were added in Update 0.12.1. They are Spiders or Cave Spiders ridden by Wither Skeletons and have 1% chance to spawn naturally in the nether or by a spider spawn egg.
 * Since Update 0.14.0, baby zombies can ride spiders or Cave spiders. This is a version exclusive to Minecraft Pe.