Do cave spiders only spawn from their respective spawners or do they also spawn naturally in abandoned mineshafts?

Question

Me and my friend had an argument over this, him saying they can only spawn with the help of spawners. Though I vaguely remember seeing one in an abandoned mineshaft AND a normal cave. It was a few years ago that I had seen 'em, so I don't really trust my memory.

Answer 1

The wiki states that they only spawn from the spawners.

Once a spawners is removed, or nullified, they will no longer spawn.