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This is a list of animals by number of neurons in their brain. These numbers are estimations derived by multiplying the density of neurons in a particular animal by the average weight or mass of the animal's brain


Neurons are the cells in the brain which transmit information to and from body parts. In the simplest organisms, they act only to drive the organism to respond to certain stimuli. In higher organisms, reasoning abilities come into play and we can see animals working collectively to achieve a similar goal. Humans are the only higher animals which are capable of abstraction, most likely as a direct result of the immense number of neurons present.[How to reference and link to summary or text]


Listed from A-Z

Name Neurons Details
Ant 10,000-100,000[1] Varies per species

Ant head closeup.jpg

C. elegans 302[2]

#REDIRECT Template:Puic

Honey Bee 850,000[3]

Bees Collecting Pollen 2004-08-14.jpg

Human 100,000,000,000[4] Adult


Rat 21,000,000[5]

Rattus norvegicus 1.jpg


Listed numerically from greatest number of neurons to least number of neurons

Name Neurons Details
Human 100,000,000,000 Adult
Rat 21,000,000
Honey Bee 850,000
Ant 10,000-100,000 Varies per species
C. elegans 302
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