Some whales/dolphins have more neurons in their cortices than humans.
That being said, I’d be reluctant to rely too much on raw counts to decide moral weight. There are many other considerations. Check out Jason Schukraft’s work for Rethink Priorities.
This might be of interest:
https://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons#Sensory-associative_structure
Some whales/dolphins have more neurons in their cortices than humans.
That being said, I’d be reluctant to rely too much on raw counts to decide moral weight. There are many other considerations. Check out Jason Schukraft’s work for Rethink Priorities.