บทคัดย่อ, ส้ม, สีแดง, สีเขียว, สีน้ำเงิน, นกเป็ดน้ำ, เขตร้อน, พื้นหลัง, ขี้ขลาด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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