Animals
Today I am thinking of Alex the parrot again. The first and only known non-human to ask an existential question. His last words to his caretaker: "You be good, I love you. See you tomorrow".
I wonder how much animals can really know. Octopi come to mind when I think of consciousness. They are very smart -- smarter than we thought. Their neurons are distributed throughout their tentacles, it must be very strange to think and communicate with your arms. Although if your love language is physical touch, then you know all about this.