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The term llama is sometimes used more broadly, to indicate any of the four closely related animals that make up the South American branch of the family Camelidae: the true llama, the vicuņa, alpaca, and guanaco. They were used as a system of transportation for the Incas.
Differentiating characteristics between llamas and alpacas are that llamas are larger and have more elongated heads. Alpacas are sometimes considered to have more valuable fiber, as it is typically finer than that of a llama. Alpacas also tend to have darker fur than that of llamas.