Excellent short article.
https://www.theneweuropean.co.uk/everyday-philosophy-the-ethics-of-octopus-farming/
I see it mentions right at the beginning "Other Minds" by Peter Godfrey-Smith. This is an excellent, hands-on as well as scientifically rigorous study of the consciousness and life-styles of octopuses, which extends the investigation into the nature of consciousness itself.
By coincidence, I'm reading his next book, Metazoa, which continues his investigation from an evolutionary point of view, and also contains further observations about octopuses. Equally fascinating, but necessarily contains much speculation (difficult to ascertain the level of consciousness of fossils, unless they're Jacob Rees Mogg).