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Hummingbirds are the smallest mature birds, measuring 7.5–13 cm (3–5 in) in length. The smallest is the 5 cm (2.0 in) bee hummingbird , which weighs less than 2.0 g (0.07 oz), and the largest is the 23 cm (9 in) giant hummingbird , weighing 18–24 grams (0.63–0.85 oz).