Sea snakes are venomous snakes that live their entire lives in seawater. Sea snakes have upward-facing nostrils with valves that can be closed back. After inhaling air, they can close their nostrils and dive underwater for up to 10 minutes. The surface of the body is covered with scales, and underneath the scales is thick skin to prevent seawater from penetrating and losing body fluids. The salt glands under the tongue have the function of expelling excess salt that enters the body with food. Small sea snakes are half a meter long, and large sea snakes can reach about 3 meters. They live in coastal waters, especially in brackish water estuaries, and feed on fish. Except for a few sea snakes that lay eggs, the rest all give birth to young and are ovoviviparous.
There are 19 species of sea snakes in my country, which are widely distributed in the coastal waters of Guangdong, Guangxi, Fujian, Taiwan, Zhejiang, Shandong, Liaoning and other provinces. Common ones include the green-ringed sea snake, the flat-chinned sea snake and the long-nosed sea snake. Sea snakes are used medicinally and have the effects of dispelling wind and relieving pain, activating blood circulation and unblocking meridians, nourishing and strengthening the body.
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