นกนางนวล, การบิน, เที่ยวบิน, นกนางนวลบิน, กลุ่มนกนางนวลบิน, อาณานิคม, นก, นกบิน, นกวิทยา, หอคอย, คน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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