List of animals by number of neurons
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The following are two lists of animals ordered by the size of their nervous system. The first list shows number of neurons in their entire nervous system. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence.[1] The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex.[2][1]
Neuron counts constitute an important source of insight on the topic of neuroscience and intelligence: the question of how the evolution of a set of components and parameters (~1011 neurons, ~1014 synapses) of a complex system leads to the phenomenon of intelligence.[3]