This depends on your definition of self-awareness. I'm using what I think is a reasonable, mundane framework: self awareness is a spectrum of diverse capabilities that includes any system with some amount of internal observation.

I think the definition that a lot of folks are using is a binary distinction between things which experience the ability to observe their own ego observing itself and those that don't. Which I think is useful if your goal is to maintain a belief in human exceptionalism, but much less so if you're trying to genuinely understand consciousness.

A lizard has no ego. But it is aware of its comfort and will move from a cold spot to a warmer spot. That is low-level self awareness, and it's not rare or mystical.