After having ascertained with the "Stupidity of the Octopus" that these organisms are great intelligent people, we are going to discover that they feel pain similar to that of humans!
"Behavioral and neurophysiological evidence suggest affective pain experience in octopus". Crook R.L., 2021.
"Evolution of mechanisms and behaviour important for pain". Waltersvand E.T., Amanda C. Williams A. C. de C, 2019.