How Many Brain Cells Does a Baby Have

Wikipedia list article

Brief comparisons of number of whole brain neurons (top) and cerebral cortex neurons (bottom) among six mammals.

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, indicating their overall neural complexity. 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]}

Overview [edit]

Neurons are the cells that transmit information in an animal's nervous system so that it can sense stimuli from its environment and behave accordingly. Not all animals have neurons; Trichoplax and sponges lack nerve cells altogether.

Neurons may be packed to form structures such as the brain of vertebrates or the neural ganglions of insects.

The number of neurons and their relative abundance in different parts of the brain is a determinant of neural function and, consequently, of behavior.

Whole nervous system [edit]

All numbers for neurons (except Caenorhabditis and Ciona), and all numbers for synapses (except Ciona) are estimations.

Name	Neurons in the brain & whole nervous system	Synapses	Details	Image	Source
Sponge	0				[3]
Trichoplax	0		Despite no nervous system, it exhibits coordinated feeding and response behaviors.[4]		[5]
Asplanchna brightwellii (rotifer)	about 200		Brain only		[6]
Tardigrade	about 200		Brain only		[7]
Ciona intestinalis larva (sea squirt)	231	8,617 (central nervous system only)			[8] [9]
Caenorhabditis elegans (roundworm)	302	~7,500	is the only organism to have its whole connectome (neuronal "wiring diagram") completed.[10] [11] [12]		[13]
Jellyfish	5,600		Hydra vulgaris (H. attenuate)		[14]
Megaphragma mymaripenne	7,400				[15]
Box jellyfish	8,700–17,500		adult Tripedalia cystophora (8 mm diameter) – does not include 1000 neurons in each of the four rhopalia		[16]
Medicinal leech	10,000				[17]
Pond snail	11,000				[18]
Sea slug	18,000				[19]
Amphioxus	20,000		central nervous system only		[20] [21]
Larval zebrafish	100,000				[22]
Lobster	100,000				[23]
Fruit fly	100,000	< 10,000,000 [ citation needed ]			[24]
Wandering spider	100,000				[25]
Calliopsis (bee)	234,000				[26]
Ant	250,000		Varies per species		[27]
Perdita (genus)	275,000				[26]
Melissodes	495,000				[26]
Bombus impatiens	557,000				[26]
Western honey bee	613,000				[26]
Honey bee	960,000	~1×10 ^ 9			[28]
Cockroach	1,000,000				[29]
Coconut crab	>1,000,000		c. 1,000,000 interneurons are dedicated to analysing olfactory input alone.		[30]
California carpenter bee	1,180,000				[26]
Anolis cristatellus	4,270,000				[31]
Guppy	4,300,000				[32]
Ocelot gecko	4,420,000				[33]
Anolis evermanni	4,920,000				[31]
Adult zebrafish	~10,000,000		cells (neurons + other)		[34]
Frog	16,000,000				[35]
Naked mole-rat	26,880,000				[36]
Little free-tailed bat	35,000,000				[37]
Smoky shrew	36,000,000				[38]
Short-tailed shrew	52,000,000				[38]
Common bent-wing bat	56,000,000				[37]
African sheath-tailed bat	59,000,000				[37]
Hottentot golden mole	65,000,000				[39]
Woermann's bat	66,000,000				[37]
Zenker's fruit bat	66,000,000				[37]
Commerson's roundleaf bat	67,000,000				[37]
Rufous trident bat	70,000,000				[37]
House mouse	71,000,000	~1×10 ^ 12			[40]
Nile crocodile	80,500,000				[41]
Heart-nosed bat	81,000,000				[37]
Golden hamster	90,000,000				[40]
Short-palated fruit bat	99,000,000				[37]
Ansell's mole-rat	103,000,000				[42]
Mashona mole-rat	113,000,000				[42]
Hairy-tailed mole	124,000,000				[39]
Eastern rock elephant shrew	129,000,000				[39]
Star-nosed mole	131,000,000				[38]
Zebra finch	131,000,000		Brain only		[43]
Silvery mole-rat	148,000,000				[42]
Four-toed elephant shrew	157,000,000				[39]
Eurasian blackcap	157,000,000				[43]
Wahlberg's epauletted fruit bat	162,000,000				[37]
Goldcrest	164,000,000				[43]
Cape mole-rat	170,000,000				[42]
Egyptian fruit bat	172,000,000				[37]
Mechow's mole-rat	174,000,000				[42]
Damaraland mole-rat	178,000,000				[42]
Franquet's epauletted fruit bat	186,000,000				[37]
Brown rat	200,000,000	~4.48×10 ^ 11			[44]
Guyenne spiny rat	202,000,000				[39]
Eastern mole	204,000,000				[38]
Red junglefowl	221,000,000				[43]
Great tit	226,000,000				[43]
Green-rumped parrotlet	227,000,000				[43]
Guinea pig	240,000,000				[40]
Gray mouse lemur	254,710,000				[45]
Common treeshrew	261,000,000				[46]
Hammer-headed bat	275,000,000				[37]
Pigeon	310,000,000		Brain only		[43]
Budgerigar	322,000,000				[43]
Cape dune mole-rat	361,000,000				[42]
Common blackbird	379,000,000				[43]
Ferret	404,000,000				[47]
Cockatiel	453,000,000				[43]
Gray squirrel	453,660,000				[36]
Banded mongoose	454,000,000				[47]
Prairie dog	473,940,000				[36]
Common starling	483,000,000				[43]
European rabbit	494,200,000				[36]
Octopus	500,000,000				[48]
Western tree hyrax	505,000,000				[39]
Common marmoset	636,000,000				[46]
Eastern rosella	642,000,000				[43]
Barn owl	690,000,000				[43]
Monk parakeet	697,000,000				[43]
Azure-winged magpie	741,000,000				[43]
Rock hyrax	756,000,000				[39]
Cat	760,000,000	~1×10 ^ 13			[49]
Black-rumped agouti	857,000,000				[40]
Magpie	897,000,000				[43]
Common hill myna	906,000,000				[43]
Northern greater galago	936,000,000				[46]
Western jackdaw	968,000,000				[43]
Eurasian jay	1.085×10 ^ 9				[43]
Alexandrine parakeet	1.096×10 ^ 9				[43]
Raccoon dog	1.16×10 ^ 9				[50]
Tanimbar corella	1.161×10 ^ 9				[43]
Emu	1.335×10 ^ 9				[43]
Three-striped night monkey	1.468×10 ^ 9				[46]
Rook	1.509×10 ^ 9				[43]
Grey parrot	1.566×10 ^ 9				[43]
Capybara	1.6×10 ^ 9				[40]
Jackal	1.73×10 ^ 9				[50]
Fox	2.11×10 ^ 9				[50]
Sulphur-crested cockatoo	2.122×10 ^ 9				[43]
Raccoon	2.148×10 ^ 9				[47]
Kea	2.149×10 ^ 9				[43]
Raven	2.171×10 ^ 9		Brain only		[43]
Domestic pig	2.22×10 ^ 9				[51]
Dog	2.253×10 ^ 9				[47]
Chihuahua (dog)	2.51×10 ^ 9				[50]
Dog (Chow Chow)	2.61×10 ^ 9				[50]
Dog (Yorkshire Terrier)	2.64×10 ^ 9				[50]
Springbok	2.72×10 ^ 9				[51]
Dog (West Highland White Terrier)	2.83×10 ^ 9				[50]
Blesbok	3.06×10 ^ 9				[51]
Blue-and-yellow macaw	3.136×10 ^ 9		Brain only		[43]
Common squirrel monkey	3.246×10 ^ 9				[46]
Crab-eating macaque	3.44×10 ^ 9				[45]
Dog (German Shepherd)	3.53×10 ^ 9				[50]
Tufted capuchin	3.691×10 ^ 9				[46]
Bonnet macaque	3.78×10 ^ 9				[45]
Striped hyena	3.885×10 ^ 9				[47]
Dog (Komondor)	3.99×10 ^ 9				[50]
Dog (Transylvanian Hound)	4.39×10 ^ 9				[50]
Lion	4.667×10 ^ 9				[47]
Greater kudu	4.91×10 ^ 9				[51]
Rhesus macaque	6.376×10 ^ 9				[46]
Brown bear	9.586×10 ^ 9				[47]
Giraffe	1.075×10 ^ 10				[51]
Yellow baboon	1.095×10 ^ 10				[45]
Chimpanzee	2.8×10 ^ 10				[52]
Orangutan	3.26×10 ^ 10				[53]
Gorilla	3.34×10 ^ 10				[53]
Human	8.6×10 ^ 10	~1.5×10 ^ 14	Neurons for average adult		[54] [55] [56]
African elephant	2.57×10 ^ 11				[57] [58]

List of animal species by forebrain (cerebrum or pallium) neuron number [edit]

The question of what physical characteristic of an animal makes an animal intelligent has varied over the centuries. One early speculation was brain size (or weight, which provides the same ordering.) A second proposal was brain-to-body-mass ratio, and a third was encephalization quotient, sometimes referred to as EQ. The current best predictor is number of neurons in the forebrain, based on Herculano-Houzel's improved neuron counts.^[1] It accounts most accurately for variations in dependence on the cerebellum. The elephant depends on its exceptionally large cerebellum, while birds make do with a much smaller one.

Differing methods have been used to count neurons and these may differ in degree of reliability. These are the optical fractionator, an application of stereology and the isotropic fractionator, a recent methodological innovation. Most numbers in the list are the result of studies using the newer isotropic fractionator.^{[1] [36] [26] [40] [41] [43] [44] [45] [46] [51] [52] [53] [54] [55] [57] [59]} A variation of the optical fractionator was responsible for the previous total human brain neuron count of 100,000,000,000 neurons, which has been revised down to 86,000,000,000 by the use of the isotropic fractionator. This is in part why it may be considered to be less reliable. Finally, some numbers are the result of estimations based on correlations observed between number of cortical neurons and brain mass within closely related taxa.

The following table gives information on the number of neurons estimated to be in the sensory-associative structure (such as the pallium).

Common name	Average number of sensory-associative structure neurons [a]	Intraspecific variation[b]	Method[c]	Sensory-associative structure	Binomial nomenclature	Image	Source
Common fruit fly	2,500*		Optical fractionator	Corpora pedunculata	Drosophila melanogaster		[60]
House cricket	50,000*		Optical fractionator	Corpora pedunculata	Acheta domesticus		[60]
Honey bee	170,000*		Optical fractionator	Corpora pedunculata	Genus: Apis		[60]
Common cockroach	200,000*		Optical fractionator	Corpora pedunculata	Genus: Periplaneta		[60]
African sheath-tailed bat	5,000,000		Isotropic fractionator	Pallium (cortex)	Coleura afra		[37]
Rufous trident bat	6,000,000		Isotropic fractionator	Pallium (cortex)	Triaenops persicus		[37]
Naked mole-rat	6,000,000	± 1,065,587[39]	Isotropic fractionator	Pallium (cortex)	Heterocephalus glaber		[36]
Little free-tailed bat	6,000,000		Isotropic fractionator	Pallium (cortex)	Chaerephon pumilus		[37]
Common bent-wing bat	6,000,000		Isotropic fractionator	Pallium (cortex)	Miniopterus schreibersii		[37]
Commerson's roundleaf bat	8,000,000		Isotropic fractionator	Pallium (cortex)	Hipposideros commersoni		[37]
Heart-nosed bat	10,000,000		Isotropic fractionator	Pallium (cortex)	Cardioderma cor		[37]
Ansell's mole-rat	10,000,000		Isotropic fractionator	Pallium (cortex)	Fukomys anselli		[42]
Smoky shrew	10,000,000	± 352,000[39]	Isotropic fractionator	Pallium (cortex)	Sorex fumeus		[39]
Short-palated fruit bat	10,000,000		Isotropic fractionator	Pallium (cortex)	Casinycteris argynnis		[37]
Mashona mole-rat	12,000,000		Isotropic fractionator	Pallium (cortex)	Fukomys darlingi		[42]
Woermann's bat	12,000,000		Isotropic fractionator	Pallium (cortex)	Megaloglossus woermanni		[37]
Northern short-tailed shrew	12,000,000	± 1,569,000[39]	Isotropic fractionator	Pallium (cortex)	Blarina brevicauda		[39]
Zenker's fruit bat	13,000,000		Isotropic fractionator	Pallium (cortex)	Scotonycteris zenkeri		[37]
House mouse	14,000,000	± 2,242,257[39]	Isotropic fractionator	Pallium (cortex)	Mus musculus		[39]
Hairy-tailed mole	16,000,000	± 2,611,000[39]	Isotropic fractionator	Pallium (cortex)	Parascalops breweri		[39]
Star-nosed mole	17,000,000	± 3,105,000[39]	Isotropic fractionator	Pallium (cortex)	Condylura cristata		[39]
Golden hamster	17,000,000	± 3,619,934[39]	Isotropic fractionator	Pallium (cortex)	Mesocricetus auratus		[39]
Damaraland mole-rat	21,000,000		Isotropic fractionator	Pallium (cortex)	Fukomys damarensis		[42]
Hottentot golden mole	22,000,000	± 2,154,000[39]	Isotropic fractionator	Pallium (cortex)	Amblysomus hottentotus		[39]
Gray mouse lemur	22,310,000		Isotropic fractionator	Pallium (cortex)	Microcebus murinus		[45]
Mechow's mole-rat	23,000,000		Isotropic fractionator	Pallium (cortex)	Fukomys mechowii		[42]
Franquet's epauletted fruit bat	23,000,000		Isotropic fractionator	Pallium (cortex)	Epomops franqueti		[37]
Hammer-headed bat	24,000,000		Isotropic fractionator	Pallium (cortex)	Hypsignathus mostrosus		[37]
Hedgehog	24,000,000^		Estimated	Pallium (cortex)	Subfamily Erinaceinae, various species		[61]
Silvery mole-rat	25,000,000		Isotropic fractionator	Pallium (cortex)	Heliophobius argenteocinereus		[42]
Wahlberg's epauletted fruit bat	26,000,000		Isotropic fractionator	Pallium (cortex)	Epomophorus wahlbergi		[37]
Cape mole-rat	26,000,000		Isotropic fractionator	Pallium (cortex)	Georychus capensis		[42]
Guyenne spiny rat	26,000,000	± 2,155,723[39]	Isotropic fractionator	Pallium (cortex)	Proechimys cayennensis		[39]
Eastern rock elephant shrew	26,000,000	± 4,020,000[39]	Isotropic fractionator	Pallium (cortex)	Elephantulus myurus		[39]
Eastern mole	27,000,000	± 5,113,000[39]	Isotropic fractionator	Pallium (cortex)	Scalopus aquaticus		[39]
Opossum	27,000,000^		Estimated	Pallium (cortex)	Didelphis virginiana		[61]
Egyptian fruit bat	29,000,000		Isotropic fractionator	Pallium (cortex)	Rousettus aegyptiacus		[37]
Brown Rat	31,000,000	+ 3,034,654[39]	Isotropic fractionator	Pallium (cortex)	Rattus norvegicus		[39]
Four-toed elephant shrew	34,000,000	± 5,840,000[39]	Isotropic fractionator	Pallium (cortex)	Petrodromus tetradactylus		[39]
Ferret	38,950,000		Isotropic fractionator	Pallium (cortex)	Mustela putorius furo		[47]
Cape dune mole-rat	43,000,000		Isotropic fractionator	Pallium (cortex)	Bathyergus suillus		[42]
Guinea pig	43,510,000	± 3,169,924[39]	Isotropic fractionator	Pallium (cortex)	Cavia porcellus		[36]
Eurasian blackcap	52,000,000		Isotropic fractionator	Pallium (DVR)	Sylvia atricapilla		[43]
Prairie dog	53,770,000	± 6,044,322[39]	Isotropic fractionator	Pallium (cortex)	Genus:Cynomys		[36]
Zebra finch	55,000,000		Isotropic fractionator	Pallium (DVR)	Taeniopygia guttata		[43]
Common treeshrew	60,000,000	± 26,510,000[39]	Isotropic fractionator	Pallium (cortex)	Tupaia glis		[39]
Red junglefowl	61,000,000		Isotropic fractionator	Pallium (DVR)	Gallus gallus		[43]
Goldcrest	64,000,000		Isotropic fractionator	Pallium (DVR)	Regulus regulus		[43]
European rabbit	71,450,000		Isotropic fractionator	Pallium (cortex)	Oryctolagus cuniculus		[36]
Rock dove	72,000,000		Isotropic fractionator	Pallium (DVR)	Columba livia		[43]
Eastern gray squirrel	77,330,000	± 2,634,444[39]	Isotropic fractionator	Pallium (cortex)	Sciurius carolinensis		[36]
Great tit	83,000,000		Isotropic fractionator	Pallium (DVR)	Parus major		[43]
Western tree hyrax	99,000,000		Isotropic fractionator	Pallium (cortex)	Dendrohyrax dorsalis		[39]
Green-rumped parrotlet	103,000,000		Isotropic fractionator	Pallium (DVR)	Forpus passerinus		[43]
Black-rumped agouti	113,000,000	± 2,576,768[39]	Isotropic fractionator	Pallium (cortex)	Dasyprocta prymnolopha		[1]
Banded mongoose	115,770,000		Isotropic fractionator	Pallium (cortex)	Mungos mungo		[47]
Common blackbird	136,000,000		Isotropic fractionator	Pallium (DVR)	Turdus merula		[43]
Budgerigar	149,000,000		Isotropic fractionator	Pallium (DVR)	Melopsittacus undulatus		[43]
Rock hyrax	198,000,000	± 29,082,000[39]	Isotropic fractionator	Pallium (cortex)	Procavia capensis		[39]
Northern greater galago	226,000,000	± 87,570,000[39]	Isotropic fractionator	Pallium (cortex)	Otolemur garnettii		[39]
Common starling	226,000,000		Isotropic fractionator	Pallium (DVR)	Sturnus vulgaris		[43]
Raccoon dog	240,180,000		Isotropic fractionator	Pallium (cortex)	Nyctereutes procyonoides		[50]
Common marmoset	245,000,000	± 81,180,000[39]	Isotropic fractionator	Pallium (cortex)	Callithrix jacchus		[39]
House cat	249,830,000		Isotropic fractionator	Pallium (cortex)	Felis catus		[47]
Brown bear	250,970,000		Isotropic fractionator	Pallium (cortex)	Ursus arctos		[47]
Cockatiel	258,000,000		Isotropic fractionator	Pallium (DVR)	Nymphicus hollandicus		[43]
Capybara	306,500,000	± 62,726,120[39]	Isotropic fractionator	Pallium (cortex)	Hydrochoerus hydrochaeris		[36]
Tarsius	310,000,000		Estimated	Pallium (cortex)	Genus: Tarsius, unknown species		[62]
Eastern rosella	333,000,000		Isotropic fractionator	Pallium (DVR)	Platycercus eximius		[43]
Red fox	355,010,000		Isotropic fractionator	Pallium (cortex)	Vulpes vulpes		[50]
Goeldi's marmoset	357,130,000		Isotropic fractionator	Pallium (cortex)	Callimico goeldii		[45]
Western grey kangaroo	370,170,000		Isotropic fractionator	Pallium (cortex)	Macropus fuliginosus		[63]
Golden jackal	393,620,000		Isotropic fractionator	Pallium (cortex)	Canis aureus		[50]
Monk parakeet	396,000,000		Isotropic fractionator	Pallium (DVR)	Myiopsitta monachus		[43]
Springbok	396,900,000		Isotropic fractionator	Pallium (cortex)	Antidorcas marsupialis		[51]
Azure-winged magpie	400,000,000		Isotropic fractionator	Pallium (DVR)	Cyanopica cyanus		[43]
Common hill myna	410,000,000		Isotropic fractionator	Pallium (DVR)	Gracula religiosa		[43]
Domesticated pig	425,000,000*		Optical fractionator	Pallium (cortex)	Sus scrofa domesticus		[64]
Barn owl	437,000,000		Isotropic fractionator	Pallium (DVR)	Tyto alba		[43]
Emu	439,000,000		Isotropic fractionator	Pallium (DVR)	Dromaius novaehollandiae		[43]
West Highland White Terrier	440,160,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Three-striped night monkey	442,000,000	± 111,310,000[39]	Isotropic fractionator	Pallium (cortex)	Aotus trivirgatus		[1]
Eurasian magpie	443,000,000		Isotropic fractionator	Pallium (DVR)	Pica pica		[43]
Raccoon	453,000,000		Isotropic fractionator	Pallium (cortex)	Procyon lotor		[59]
Chow Chow	471,500,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Western jackdaw	492,000,000		Isotropic fractionator	Pallium (DVR)	Coloeus monedula		[43]
Striped hyena	495,280,000		Isotropic fractionator	Pallium (cortex)	Hyaena hyaena		[47]
Chihuahua	513,330,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Eurasian jay	529,000,000		Isotropic fractionator	Pallium (DVR)	Garrulus glandarius		[43]
Lion	545,240,000		Isotropic fractionator	Pallium (cortex)	Panthera leo		[47]
Blesbok	570,670,000		Isotropic fractionator	Pallium (cortex)	Damaliscus pygargus phillipsi		[51]
Yorkshire Terrier	572,140,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Alexandrine parakeet	575,000,000		Isotropic fractionator	Pallium (DVR)	Psittacula eupatria		[43]
Tanimbar corella	599,000,000		Isotropic fractionator	Pallium (DVR)	Cacatua goffiniana		[43]
Golden retriever	627,000,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[47]
Gracile capuchin monkey	650,000,000^		Estimated	Pallium (cortex)	Genus: Cebus		[65]
Transylvanian Hound	725,760,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Greater kudu	762,570,000		Isotropic fractionator	Pallium (cortex)	Tragelaphus strepsiceros		[51]
Crab-eating macaque	800,960,000		Isotropic fractionator	Pallium (cortex)	Macaca fascicularis		[45]
Rook	820,000,000		Isotropic fractionator	Pallium (DVR)	Corvus frugilegus		[43]
Beagle	844,410,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Grey parrot	850,000,000		Isotropic fractionator	Pallium (DVR)	Psittacus erithacus		[43]
Komondor	883,380,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
German Shepherd	885,460,000		Isotropic fractionator	Pallium (cortex)	Canis lupus familiaris		[50]
Sulphur-crested cockatoo	1,135,000,000		Isotropic fractionator	Pallium (DVR)	Cacatua galerita		[43]
Tufted capuchin	1,140,000,000		Isotropic fractionator	Pallium (cortex)	Sapajus apella		[39] [1]
Harp seal	1,168,000,000^ 6,100,000,000*		Estimated Optical fractionator	Pallium (cortex)	Pagophilus groenlandicus		[66] [67]
Horse	1,200,000,000*		Optical fractionator	Pallium (cortex)	Equus ferus caballus		[68]
Raven	1,204,000,000		Isotropic fractionator	Pallium (DVR)	Corvus corax		[43]
Kea	1,281,000,000		Isotropic fractionator	Pallium (DVR)	Nestor notabilis		[43]
Common squirrel monkey	1,340,000,000	± 20,000,000[39]	Isotropic fractionator	Pallium (cortex)	Saimiri sciureus		[39]
Bonnet macaque	1,660,000,000		Isotropic fractionator	Pallium (cortex)	Macaca radiata		[39]
Rhesus macaque	1,710,000,000		Isotropic fractionator	Pallium (cortex)	Macaca mulatta		[39]
Giraffe	1,731,000,000		Isotropic fractionator	Pallium (cortex)	Giraffa camelopardalis		[51]
Blue and yellow macaw	1,900,000,000		Isotropic fractionator	Pallium (DVR)	Ara ararauna		[43]
Pygmy sperm whale	2,020,000,000*		Optical fractionator	Pallium (cortex)	Kogia breviceps		[69]
Leopard seal	2,386,000,000^		Estimated	Pallium (cortex)	Hydrurga leptonyx		[66]
Guenon	2,500,000,000^		Estimated	Pallium (cortex)	Genus: Cercopithecus, unknown species		[62]
Pigtail Macaque	2,531,000,000^		Estimated	Pallium (cortex)	Macaca nemestrina		[66]
Gelada baboon	2,568,000,000^		Estimated	Pallium (cortex)	Theropithecus gelada		[66]
Red-and-green macaw	2,646,000,000^		Estimated	Pallium (DVR)	Ara chloropterus		[66]
Harbor porpoise	2,750,000,000*		Optical fractionator	Pallium (cortex)	Phocoena phocoena		[66] [67]
Yellow baboon	2,880,000,000		Isotropic fractionator	Pallium (cortex)	Papio cynocephalus		[45]
Hyacinth macaw	2,944,000,000^		Estimated	Pallium (DVR)	Anodorhynchus hyacinthinus		[66]
Hamadryas baboon	2,990,000,000^		Estimated	Pallium (cortex)	Papio hamadryas		[66]
Mandrill	3,102,000,000^		Estimated	Pallium (cortex)	Mandrillus sphinx		[66]
Walrus	3,929,000,000^		Estimated	Pallium (cortex)	Odobenus rosmarus		[66]
Southern elephant seal	3,994,000,000^		Estimated	Pallium (cortex)	Mirounga leonina		[66]
African elephant	5,600,000,000		Isotropic fractionator	Pallium (cortex)	Loxodonta africana		[57]
Short-beaked common dolphin	6,700,000,000*		Optical fractionator	Pallium (cortex)	Delphinus delphis		[66] [69]
Asian elephant	6,775,000,000^		Estimated	Pallium (cortex)	Elephas maximus		[66]
Pygmy chimpanzee or bonobo	7,250,000,000^		Estimated	Pallium (cortex)	Pan paniscus		[66]
Chimpanzee	7,400,000,000*		Optical fractionator	Pallium (cortex)	Pan troglodytes		[70]
Orangutan	7,704,000,000^ - 8,900,000,000^		Estimated	Pallium (cortex)	Genus: Pongo		[66] [53]
Western gorilla	9,100,000,000^		Estimated	Pallium (cortex)	Gorilla gorilla		[66] [53]
Cuvier's beaked whale	9,100,000,000*		Optical fractionator	Pallium (cortex)	Ziphius cavirostris		[69]
Beluga whale	10,000,000,000^		Estimated	Pallium (cortex)	Delphinapterus leucas		[66]
Bottlenose dolphin	12,700,000,000*		Optical fractionator	Pallium (cortex)	Tursiops truncatus		[66] [69]
Common minke whale	12,800,000,000*		Optical fractionator	Pallium (cortex)	Balaenoptera acutorostrata		[71]
Fin whale	15,000,000,000*		Optical fractionator	Pallium (cortex)	Balaenoptera physalus		[66] [72]
Blue whale	15,000,000,000^		Estimated	Pallium (cortex)	Balaenoptera musculus		[66]
Human	16,340,000,000 21,000,000,000*	± 2,170,000,000[39]	Isotropic fractionator Optical fractionator	Pallium (cortex)	Homo sapiens		[39] [54] [1] [73] [74]
Risso's dolphin	18,750,000,000^		Estimated	Pallium (cortex)	Grampus griseus		[66]
Short-finned pilot whale	35,000,000,000^		Estimated	Pallium (cortex)	Globicephala macrorhynchus		[66]
Long-finned pilot whale	37,200,000,000*		Optical fractionator	Pallium (cortex)	Globicephala melas		[75]
Killer whale	43,100,000,000*		Optical fractionator	Pallium (cortex)	Orcinus orca		[66] [69]

See also [edit]

• Lists of animals
• Brain size
• Brain-to-body mass ratio
• Encephalization quotient
• Connectome
• Connectomics
• Cranial capacity
• Noogenesis

Notes [edit]

1. ^ ^ = Estimated
   * = Optical fractionator
2. ^ ± standard deviation
3. ^ For the estimated values, the numbers of cortical neurons estimated from brain mass for different mammalian and bird orders are based on correlation observed between number of cortical neuron and brain mass per order^[39]

References [edit]

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How Many Brain Cells Does a Baby Have

Source: https://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons

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