List of animals by number of neurons

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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

[edit] Overview

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.^{[citation needed]}

[edit] Alphabetically

Listed from A-Z

Name	Neurons	Details
Ant	10,000-100,000[1]	Varies per species
C. elegans	302[2]
Cockroach	1,000,000[3]
Frog	16,000,000[4]
Fruit fly	100,000[5]
Honey Bee	850,000[6]
Human	100,000,000,000[7]	Adult
Octopus	300,000,000[8]
Pond snail	11,000[9]
Rat	21,000,000[10]
Sea slug	7,000[11]

[edit] Numerically

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

Name	Neurons	Details
Human	100,000,000,000	Adult
Octopus	300,000,000
Rat	21,000,000
Frog	16,000,000
Cockroach	1,000,000
Honey Bee	850,000
Fruit fly	100,000
Ant	10,000-100,000	Varies per species
Pond snail	11,000
Sea slug	7,000
C. elegans	302