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Tiếng Hót Tuyệt Diệu Của Chim Ruồi Đen Jacobin

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Hummingbirds are some of the smallest birds in the world. They have beautiful iridescent feathers and super-fast wings. Their wings move so fast, that they look just like ablur. Their fast wings also make a wonderful humming noise that's why they're called" hummingbirds."