นางนวลหัวดำ, นกบิน, นก, แม่น้ำ, นกวิทยา, ธรรมชาติ, สายพันธุ์, สัตว์, นกนางนวล, การบิน, สีน้ำเงิน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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