Languages may differ with regard to the point in the animacy hierarchy where sex-based gender assignment occurs (e.g., whether masculine or feminine is restricted to humans only, or includes domestic animals etc.). Typically, with lower-order animates, sex-based assignment will not play a role. As well as the label 'masculine', it is also possible to use an arbitrary label, such as an ArabicNumeralGender or romanNumeralGender for this value. This may be the case in certain traditions (e.g., descriptions of Bantu and Daghestanian languages) where there is a larger number of gender values, or where the sex-based assignment system is limited to a particular portion of the animates.
References:Mithun (1999:96-7) FROM Hymes (1955:90-131)