From Subjective Personality: "Each animal stack has been given a corresponding animal emoji based on an extroversion rating and survey data compiled from EmojiMash . Check out our article on SubjectivePersonality.com for more information on the Spectrum of Extroversion within Objective Personality and the various factors within a type that come into play for a type's perceived 'extroversion'." This kind of helps you grok the look of each type as well. I will do the female version later.