Typological category of gender
The typological category of gender consists of the notions of natural (biological sex and the grammatical (formal) gender. The connection of this category with the natural sex is in the animals and birds. It is displayed by the nouns and pronouns in English. (But in Russian it can also expressed by the adjectives and the past simple tense forms of the verbs.) Most of the Uzbek grammar books do not contain any information about the category of gender of Uzbek nouns, because the authors consider Uzbek nouns not to have this category at all.