Seals really are some of the most fascinating creatures that are found on earth. They're fat, they're soft and squishy, they're kind of cuddly in appearance, and if you've ever been to a sea world show, they, can bark like dogs and they know a lot of interesting tricks that are used to entertain the audience. Really though, there are several different kinds of species of seats that are found on earth that include fur seals, sea lions, and the normal everyday common seals that we tend to think of In fact, there are currently 33 known species of seals found on Earth. Amazingly, despite living in the ocean and often times arctic conditions they are warm blooded mammals that breathe air. They just happen to live in, or around, the water most of their lives. The reason for their semi aquatic lifestyle is helped by the fact that seals have a nice layer of fat on them that's generally called blubber. This blubber is beneath the skin, and helps them stay nice and warm in the near freezing water.