Editing Encephalization quotient (section)

==Calculation==
Snell's equation of simple [[allometry]] is<ref>{{Cite journal |last=Williams |first=M. F. |date=2002-04-01 |title=Primate encephalization and intelligence |url=https://www.sciencedirect.com/science/article/pii/S0306987701915166 |journal=Medical Hypotheses |volume=58 |issue=4 |pages=284–290 |doi=10.1054/mehy.2001.1516 |pmid=12027521 |issn=0306-9877|url-access=subscription }}</ref>
:<math>E = CS^r,</math>
were <math>E</math> is the weight of the brain, <math>C</math> is the [[cephalization]] factor, <math>S</math> is body weight, and <math>r</math> is the exponential constant.

The "encephalization quotient" (EQ) is the coefficient <math>C</math> in Snell's allometry equation, usually normalized with respect to a reference species. In the following table, the coefficients have been normalized with respect to the value for the cat, which is therefore attributed an EQ of 1.<ref name=Serendip>{{Cite web |title=Thinking about Brain Size |url=https://serendipstudio.org/bb/kinser/Int3.html |access-date=2020-11-23}}</ref>

Another way to calculate encephalization quotient is by dividing the actual weight of an animal's brain with its predicted weight according to Jerison's formula.<ref name="roth"/>

{| class="wikitable sortable"
! Species
! Encephalization<br/> quotient (EQ)<ref name="Roth2005"/>
|-
|[[Human]]||7.4–7.8
|-
|[[Northern right whale dolphin]]||5.55<ref name="10.3389_fnhum.2011.00108">{{cite journal |last=Osvaldo |first=Cairo |title=External Measures of Cognition |journal=Frontiers in Human Neuroscience |volume=5 |issue=108 |date=2011-10-04 |page=108 |doi= 10.3389/fnhum.2011.00108 |pmid=22065955 |pmc=3207484 |quote=Table 1 |doi-access=free }}</ref>
|-
|[[Bottlenose dolphin]]||5.26<ref name="10.3389_fnhum.2011.00108"/>
|-
|[[Orca]]||2.57–3.3<ref name=Marino>{{cite journal |last1=Marino |first1=Lori |title=Cetacean Brain Evolution: Multiplication Generates Complexity |journal=International Journal of Comparative Psychology |date=31 December 2004 |volume=17 |issue=1 |pages=1–16 |citeseerx=10.1.1.183.6184 |url=https://animalstudiesrepository.org/anatom/6/ }}</ref><ref name="Marino2006"/>
|-
|[[Common chimpanzee|Chimpanzee]]||2.2–2.5<ref>{{cite web |last1=Hill |first1=Kyle |date=July 14, 2014 |title=How Science Could Make a Chimp Like DAWN OF THE PLANET OF THE APES' Caesar |url=https://archive.nerdist.com/how-science-could-make-a-chimp-like-dawn-of-the-planet-of-the-apes-caesar/ |website=archive.nerdist.com }}{{self-published inline|date=February 2020}}</ref> 
|-
|[[Raven]]
|2.49<ref name=pmid16553307>{{cite journal |last1=Emery |first1=Nathan J |title=Cognitive ornithology: The evolution of avian intelligence |journal=Philosophical Transactions of the Royal Society B: Biological Sciences |date=29 January 2006 |volume=361 |issue=1465 |pages=23–43 |doi=10.1098/rstb.2005.1736 |pmc=1626540 |pmid=16553307}}</ref>
|-
|[[Domestic Pig]] (newborn)||2.42<ref name="Minervini_2016"/>
|-
|[[Rhesus macaque]]||2.1
|-
|[[Red fox]]||1.92<ref>{{cite journal |last1=Boddy |first1=A.M. |last2=McGowen |first2=M.R. |last3=Sherwood |first3=C.C |last4=Grossman |first4=L.I. |last5=Goodman |first5=M. |last6=Wildman |first6=D.E. |title=Comparative analysis of encephalization in mammals reveals relaxed constraints on anthropoid primate and cetacean brain scaling |journal=Journal of Evolutionary Biology |date=May 2012 |volume=25 |issue=5|pages=981–994 |doi=10.1111/j.1420-9101.2012.02491.x|pmid=22435703 |s2cid=35368663 |doi-access=free }}</ref>
|-
|[[Elephant]]||1.75<ref name=Steinhausen2016/>–2.36<ref>{{cite journal |last1=Shoshani |first1=Jeheskel |last2=Kupsky |first2=William J. |last3=Marchant |first3=Gary H. |title=Elephant brain |journal=Brain Research Bulletin |date=June 2006 |volume=70 |issue=2 |pages=124–157 |doi=10.1016/j.brainresbull.2006.03.016 |pmid=16782503 |s2cid=14339772 }}</ref>
|-
|[[Raccoon]]||1.62<ref>https://www.berkeleydailyplanet.com/issue/2008-11-06/article/31551</ref>
|-
|[[Gorilla]]||1.39<ref name=Steinhausen2016/>
|-
|[[California sea lion]]||1.39<ref name=Steinhausen2016/>
|-
|[[Chinchilla]]
|1.34<ref>{{cite journal |last1=Spotorno |first1=Angel E. |last2=Zuleta |first2=Carlos A. |last3=Valladares |first3=J. Pablo |last4=Deane |first4=Amy L. |last5=Jiménez |first5=Jaime E. |title=Chinchilla laniger |journal=Mammalian Species |volume=758 |date=December 2004 |issue=758 |pages=1–9 |jstor=3504402 |doi=10.1644/758 |doi-access=free }}</ref>
|-
|[[Dog]]||1.2
|-
|[[Squirrel]]||1.1
|-
|[[Cat]]||1.00
|-
|[[Hyena]]||0.92<ref name=Steinhausen2016/>
|-
|[[Horse]]||0.92<ref name=Steinhausen2016/>
|-
|[[Elephant shrew]]||0.82<ref name=Steinhausen2016/>
|-
|[[Brown bear]]||0.82<ref name=Steinhausen2016/>
|-
|[[Sheep]]||0.8
|-
|[[Taurine cattle]]||0.52–0.59<ref name="RaiaBallarin2016">{{cite journal |last1=Ballarin |first1=Cristina |last2=Povinelli |first2=Michele |last3=Granato |first3=Alberto |last4=Panin |first4=Mattia |last5=Corain |first5=Livio |last6=Peruffo |first6=Antonella |last7=Cozzi |first7=Bruno |last8=Raia |first8=Pasquale |title=The Brain of the Domestic Bos taurus: Weight, Encephalization and Cerebellar Quotients, and Comparison with Other Domestic and Wild Cetartiodactyla |journal=PLOS ONE |date=29 April 2016 |volume=11 |issue=4 |pages=e0154580 |pmid=27128674 |pmc=4851379 |bibcode=2016PLoSO..1154580B }}</ref>
|-
|[[Mouse]]||0.5
|-
|[[Rat]]||0.4
|-
|[[Rabbit]]||0.4
|-
|[[Domestic Pig]] (adult)||0.38<ref name="Minervini_2016"/>
|-
|[[Hippopotamus]]||0.37<ref name=Steinhausen2016/>
|-
|[[Opossum]]||0.2
|-
<!-- |-
|colspan="2" style="text-align: left;" |EQ relative to the cat as standard species: EQ(cat)=1 -->
|-
|}

This measurement of approximate intelligence is more accurate for mammals than for other [[Class (biology)|classes]] and [[phylum|phyla]] of [[Animalia]].