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Sea cucumbers are football shaped creatures that lay on their side at the bottom of the ocean. They have five rows of tube feet running lengthwise. Its mouth is surrounded by tentacles that are really tubed feet. Unlike sea stars, the vascular system is not filled with sea water. Instead, sea cucumbers use a special body fluid.

Sea cucumbers are football shaped creatures that lay on their side at the bottom of the ocean. They have five rows of tube feet running lengthwise. Its mouth is surrounded by tentacles that are really tubed feet. Unlike sea stars, the vascular system is not filled with sea water. Instead, sea cucumbers use a special body fluid.

Alexander Semenov, photography // "...I now organize all WSBS underwater projects and dive by myself with a great pleasure (and always with a camera).”

Alexander Semenov, photography // "...I now organize all WSBS underwater projects and dive by myself with a great pleasure (and always with a camera).”

The giant stingray, such as this one in Cambodia's Mekong River, is the largest freshwater species on Earth.

Top 10 Terrifying Prehistoric Sea Monsters

The giant stingray, such as this one in Cambodia's Mekong River, is the largest freshwater species on Earth.

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