What's with this skeleton riding a spider?

Question

Look at this

I've found a skeleton riding a spider in my world, could it be a hidden monster ?

It was very bugging jumping up and down from the spider when the spider died quickly from another monster around.

Any explanation ?

Answer

Spider jockeys have been in the game since seecret update 8 of Alpha. They are extremely rare, but not unknown or undiscovered.

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