Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
292 | Jonathan Birch on Animal Sentience
Jonathan Birch
Well, the octopus has about 500 million neurons, so I don't know how that translates into synaptic connections. A lot. It's going to be quite a lot, yeah. Crabs' brains are much, much smaller, and it varies a great deal by species, but not dissimilar to insects in terms of the number of neurons. With bees, you have about a million neurons, Drosophila, about 100,000. Okay.
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