นก, นกอพยพ, เที่ยวบิน, ฝูง, นกวิทยา, สายพันธุ์, สัตว์, การบิน, นกนางนวล, สัตว์ในป่า, ปีกสัตว์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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