Each race (or variety) is characterized by a more or less distinct combination of inherited morphological, behavioral, physiological traits. J. Philippe Rushton
Species can be recognized by their morphological characteristics and songs. Peter R. Grant
It is useful to the historian, among others, to be able to see the commonest forms of different phenomena, whether phonetic, morphological or other, and how language lives, carries on and changes over time. Ferdinand de Saussure
To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life. Peter R. Grant
