Face recognition evolved because it was (and still is) vitally important to social lives…..of some types of wasps

Why some wasps are good with faces – and others aren’t
by Wendy Zukerman
New Scientist 1 December 2011
http://www.newscientist.com/article/dn21232-why-some-wasps-are-good-with-faces–and-others-arent.html

Wasps have a good memory for a face
by Aria Pearson
New Scientist September 2008
http://www.newscientist.com/article/dn14776-wasps-have-a-good-memory-for-a-face.html

and it appears that synaesthesia is not only limited to some humans, or to a limited degree all humans, as researchers have found evidence of synesthesia in chimpanzees:

Chimp brains may be hard-wired to evolve language

by Catherine de Lange

New Scientist 5 December 2011

http://www.newscientist.com/article/dn21242-brains-wired-for-language-if-only-chimps-could-talk.html

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