The ability to think about thinking is unique to sapient species and indeed is one of the definitions of sapience.
en.wikipedia.org A sentient and sapient stretch of roadway, he has long served as a home and haven for the strange and dispossessed.
en.wikipedia.org This oxygen-breathing civilization is aware of, but by tradition rarely interacts with, the other orders of sapient life, which include hydrogen-breathing, transcendent, mechanical, memetic, and quantum.
en.wikipedia.org These creatures are each independently sapient, and if they follow a leader it is because they choose to.
en.wikipedia.org They are not sapient; nonetheless, they are empathetic, or emopaths, who sometimes bond strongly to a sapient being.
en.wikipedia.org