A very good question - I do feel differently about fish, and I think it's the relative level of intelligence. As you suggest, it's clearly not just because bir

A very good question - I do feel differently about fish, and I think it's the relative level of intelligence. As you suggest, it's clearly not just because birds have an ability to explore an environment natively that humans don't. I'm sure that's a bias towards similarities with human intelligence - to communicate, solve puzzles, and use tools (e.g. crows and parrots) because it would be very sad if people were regularly keeping octopuses in home fish tanks.