Spider Jockeys are a rare hostile mob located in the overworld, there is only a 1% chance of them to spawn and both parts are treated as separate entities. If the spider jockey comes out during the day the skeleton will burn to death but the spider will stay alive, even if the spider is neutral the skeleton will still attack. When the skeleton part dies it can drop bones and/or arrows and bows on special occasions, when the spider dies it can drop string and/or spider eye.