นก, นกนางนวล, นกวิทยา, สายพันธุ์, สัตว์, ธรรมชาติ, นางนวล, เที่ยวบิน, ขน, การบิน, จะงอยปาก
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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