Seals are pinniped mammals with streamlined bodies, short and smooth fur, and strong wind and cold resistance. It can not only live in the water, but also land and inhabit, feeding on marine life. It is good at swimming and diving. Its swimming speed is 20 to 30 kilometers per hour, up to 37 kilometers; diving time is generally 5 to 10 minutes, up to 70 minutes. The Weddell seal has the strongest diving ability. Its general diving depth is 180 to 360 meters, with the deepest reaching 600 meters. The fat content in seal milk is quite high, up to 40-50%, which is 10-15 times the fat content in milk. Other nutrients are also higher than milk. This is one of the reasons why seal cubs grow strong and are fat. one.
Seals are distributed in almost all sea areas around the world, and are more common in cold sea areas. There are 34 species of seals in the world, with about 35 million seals. There are 6 species of seals in the Antarctic region, with about 32 million seals, accounting for 90% of the world's total seals. Obviously, the Antarctic region is an important breeding ground for seals.