Spider Mini will do spawns for every places in group of maximum 4 spiders. They will attack you if you gets closer enough.
These kind of spider will attack default Minecraft spiders for fun.
 

LostWorld Torches:

If you are holding or put a lost world torch near this spider, it will freeze with their front legs up, and you can go out or kill them. So, don't forget to bring some LostWorld Torches with you in case you are exploring caves!

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