girl wiki:
>For other senses of this word, see girl (disambiguation). A girl is a young female human. The age at which a female person transitions from girl to woman varies in different societies, typically the transition from adolescence to maturity is taken to occur in the late teens.The English word from 1290 designated a child of either sex. During the 14th century its sense was narrowed to specifically female children. Subsequently, it was extended to refer also to mature but unmarried young women since the 1530s. Usage in the sense of (romantic) "sweetheart" arose in the 17th century.
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duck wiki:
>For other uses, see Duck (disambiguation). Dendrocygninae Oxyurinae Anatinae Merginae Duck is the common name for a number of species in the Anatidae bird family. The ducks are divided between several different subfamilies listed in full in the Anatidae article. Ducks are mostly aquatic birds, mostly smaller than their relatives the swans and geese, and may be found in both fresh and salt water.
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