Normal fertilization in orangutans occurs when a viable sperm from a male successfully penetrates an egg from a female during mating. This typically happens after a courtship period, where the male displays behaviors to attract the female. Once fertilization occurs, the zygote begins to divide and develop into an embryo, eventually leading to gestation, which lasts about 8.5 months. Following gestation, the female gives birth to a single infant, though twins can occur on rare occasions.
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