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"Sand crab," the source of a small round grain of sand on the beach.

Sand-bubbler crab is a small crab (1 centimeter) with a convex curved round carapace, long slender legs, and bent claws. It has a special characteristic: gas sac on the legs and the chest to help breathe in the water.

The behavior of eating food by filtering organic substances from sand, such as plankton, bacteria, and diatoms, which, after eating, regurgitate sand into a round block and stick it behind or alongside a methodical specimen, symbolizing that the sand has already been eaten in this area, living on a muddy or sandy beach.

Source: Forest Park Pranburi, Provincial Prabhikkhiru

# Sand crab # Pranburi Park # Practicing eunuchs

# National Park Service

2025/11/17 Edited to

... Read moreหลายคนเดินเล่นชายหาดแล้วเจอ “เม็ดทรายกลมๆ เล็กๆ” วางเรียงเป็นลายเหมือนมีคนตั้งใจทำงานศิลป์ไว้บนพื้นทราย ตอนแรกฉันก็คิดว่าเป็นไข่สัตว์ทะเลหรือเศษดินจากคลื่น แต่จริงๆ แล้วส่วนใหญ่เป็นผลงานของ “ปูปั้นทราย” หรือที่บางคนเรียกปูทราย/เบญทราย หุ่นน้อย นั่นเอง เม็ดทรายกลมๆ เหล่านี้เกิดจากพฤติกรรมการกินของปูปั้นทราย ปูจะใช้ก้ามและปากค่อยๆ ตักทรายเข้ามา แล้ว “กรอง” เอาอาหารจิ๋วๆ ที่ปนอยู่ในทราย เช่น อินทรีย์สาร แพลงก์ตอน แบคทีเรีย หรือไดอะตอม พอได้สารอาหารแล้วก็จะคายทรายส่วนที่เหลือออกมาเป็นก้อนเล็กๆ กลมๆ คล้ายเม็ดลูกปัด จากนั้นมันจะเขี่ยเม็ดทรายไปไว้ด้านหลังหรือด้านข้างเป็นแนวๆ เพื่อทำเครื่องหมายว่าบริเวณนี้กินไปแล้ว เลยทำให้เราเห็นเป็นลวดลายที่ดูเป็นระเบียบมาก ถ้าสังเกตให้ดี มักจะเห็นปูปั้นทรายอยู่ใกล้ “รูบนพื้นทราย” ซึ่งเป็นที่หลบภัยและที่อยู่อาศัยของมัน บางช่วงมันจะโผล่ขึ้นมาเดินหาอาหารไม่นาน แล้วรีบกลับลงรูเมื่อมีคนเดินเข้าใกล้หรือมีเงาทาบลงมา เพราะปูตัวเล็กมาก (ประมาณ 1 ซม.) เลยระวังตัวสุดๆ ช่วงเวลาที่มีโอกาสเห็นเม็ดทรายกลมๆ เยอะๆ มักเป็นตอนน้ำลง บริเวณชายหาดหรือพื้นโคลนปนทรายที่ค่อนข้างนิ่ง หากอยากดูแบบใกล้ๆ แนะนำให้เดินเบาๆ หยุดยืนห่างจากลายเม็ดทรายสักนิด แล้วรอสักครู่ ปูจะเริ่มออกมาเดินให้เห็นเอง การใช้กล้องซูมหรือถ่ายระยะใกล้จะช่วยมาก เพราะถ้าเราเข้าไปชิดเกินไป ปูจะมุดรูทันที ข้อควรรู้เล็กๆ: เม็ดทรายกลมๆ ไม่ได้ทำให้หาดสกปรก และไม่ใช่ขยะ แต่เป็นสัญญาณว่าระบบนิเวศหาดยังมีสิ่งมีชีวิตเล็กๆ ทำงานอยู่ การช่วยกันไม่เหยียบทำลายลวดลาย และไม่แหย่รูเล่น จะช่วยให้ปูปั้นทรายยังออกมาหากินได้ตามธรรมชาติ ถ้าใครไปแถววนอุทยานปราณบุรีหรือหาดทรายธรรมชาติอื่นๆ แล้วเจอ “ก้อนทรายกลมๆ” ลองสังเกตดีๆ คุณอาจได้เห็นปูปั้นทรายตัวจริงกำลังสร้างลายสวยๆ ให้ชายหาดแบบสดๆ เลย

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