Pilot whales is the other species I’d consider for experiments—they have 37.2 billion cortical neurons.
For sperm whales we don’t have data on neuron densities (though they do have the biggest brains). I’d guess they are not quite as smart though because they can dive long and they AFAIK don’t use very collaborative hunting techniques.
The mein reason I’m interested in orcas is because they have 43 billion cortical neurons, whereas the 2 land animals with the most cortical neurons (where we have have optical-fractionator measurements) are humans and chimpanzees with 21 billion and 7.4 billion respectively. See: https://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons#Forebrain_(cerebrum_or_pallium)_only
Pilot whales is the other species I’d consider for experiments—they have 37.2 billion cortical neurons.
For sperm whales we don’t have data on neuron densities (though they do have the biggest brains). I’d guess they are not quite as smart though because they can dive long and they AFAIK don’t use very collaborative hunting techniques.