นางนวลหัวดำ, นก, นกบิน, สายพันธุ์, สัตว์, นกวิทยา, นางนวล, การบิน, นกนางนวล, สีน้ำเงิน, จะงอยปาก
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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