The maximum size of sea snakes can reach about 1 meter. They belong to ancient snakes. Now snakes on land have evolved from sea snakes. In ancient times, sea snakes were relatively large and belonged to giant snakes. Although there are dozens of species of sea snakes at present, they are generally not too big. File snakes in sea snakes belong to a relatively large kind, and their body length is generally about 60-100 cm. File snakes are also rare non-poisonous snakes among sea snakes. Their bodies are yellow-brown and their surfaces are covered with scales. In addition to file snakes, there are also some small sea snake species, about 50 cm.

The life span of sea snakes is generally about 20 years, but the specific life span will be affected by many factors. For example, different genders have different life expectancy. Female sea snakes will live longer, while male sea snakes will live shorter. In addition, sea snakes have different varieties and colors, and their life span is also different. Different patterns and varieties can live for different times. In addition, the living environment, the number of natural enemies and the killing of human beings will affect their life span. There are some sea snakes living on the bottom of the sea, and their life span will generally be longer. Because sea snakes living on the seabed can avoid human hunting and natural enemies hunting.