Editing Encephalization quotient (section)

=== Sociality ===
Another factor previously thought to have great impact on brain size is sociality and flock size.<ref>{{cite journal |doi=10.1098/rspb.2005.3283 |title=Both social and ecological factors predict ungulate brain size |first1=Susanne |last1=Shultz |first2=R.I.M. |last2=Dunbar |volume=273 |issue=1583 |journal=Proceedings of the Royal Society B: Biological Sciences |pages=207–215 |pmid=16555789 |pmc=1560022 |year=2006}}</ref> This was a long-standing theory until the correlation between frugivory and EQ was shown to be more statistically significant. While no longer the predominant inference as to selection pressure for high EQ, the social brain hypothesis still has some support.<ref name=DecasienPrimate/> For example, dogs (a social species) have a higher EQ than cats (a mostly solitary species). Animals with very large flock size and/or complex social systems consistently score high EQ, with [[dolphin]]s and [[orca]]s having the highest EQ of all [[cetaceans]],<ref name="Marino2006">{{cite journal|last1=Marino|first1=Lori|last2=Sol|first2=Daniel|last3=Toren|first3=Kristen|last4=Lefebvre|first4=Louis|date=April 2006|title=Does diving limit brain size in cetaceans?|url=https://animalstudiesrepository.org/cgi/viewcontent.cgi?article=1011&context=acwp_vsm|journal=Marine Mammal Science|volume=22|issue=2|pages=413–425|doi=10.1111/j.1748-7692.2006.00042.x|bibcode=2006MMamS..22..413M |s2cid=14898849 |url-access=subscription}}</ref> and humans with their extremely large societies and complex social life topping the list by a good margin.<ref name="Roth2005" />