![]() ![]() (Synapse counts might be better, but those are hard to come by for different species. Conveniently, I also have a ton of numbers put together on number of neurons. Getting even smaller, insects have higher brain:body-mass ratios than any vertebrate we know of: more like 1 in 6.īut brain mass isn’t quite what we want – brains are mostly water, and there are a lot of non-neuron cells in brains. A mouse has a comparable brain:body-mass ratio to a human. But as we look at smaller animals, that ratio goes up again. Among large animals, humans have famously enormous brains for our size – the highest of any large animal, it seems. Let’s look a classic measurement, the brain-mass:body-mass ratio.* Smarter animals generally have larger brain sizes for their body mass, compared to animals of similar size. ![]() One thing that surprised me when working on How Many Neurons Are There was the number of neurons in the brains of very small animals. ![]()
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