1, sea pig scientific name porpoise, belongs to the national secondary aquatic wildlife protection animals.

2. The sea pig usually inhabits the offshore where salt and fresh water meet, and its living habits and physical characteristics have important scientific research value in the fields of bionics, military science and medicine, etc. In Bohai Bay, it is known as "Bohai River God" by the fishermen.

3, the sea pig in taxonomy belongs to the porpoise family, the sea pig genus. There is only one species of sea pig, the main feature is that there is no dorsal fin, the back of the body from the front two-fifths of the caudal fin to the caudal fin between an inconspicuous bulge, bulge on the scaly skin, the whole body are light blue-gray, which are different from the porpoise genus.