Llamas typically live for 15 to 25 years, with a maximum lifespan of 28 years and 11 months; the theoretical lifespan ranges from 28 years and 11 months to 63 years and 2 months. The species reaches sexual maturity between 1 year and 4 months and 4 years of age, and their eyes open at birth, as does the ability to walk. The embryo stage involves development inside the mother, who provides nourishment. The young, called cria, drinks its mother’s milk and grows rapidly on mountain pastures for a period of 1 day to 6 months. An adult llama can reproduce and perform work such as carrying loads, and this adult stage lasts from 2 to 30 years.