Why not start off with the biggest mammal of all? The Blue Whale! Weighing in at 190 tons and a length of 108 feet, this is the largest mammal in all of the world. Land or Sea, nothing beats this.As you can see, they call it the blue whale for a reason. It feeds mainly off of small crustaceans, called krill. In summer it's the cool, high latitudes for them. But in the winter it's warmer, low latitudes for mating and birthing.

This cute, funny, and charming little thing to the right is a beluga whale. They are arctic mammals, meaning they live in cold climates, mainly way up north by the ice caps. The males can be as long as 18 feet and females can get up to 13 feet. The males can weigh any where in between 2,400 and 3,500 pounds. The females can weigh from 1,500 up to 2,600. They are always white, by the way. It feeds mainly on fish, sometimes on octopus, squid, crab, and shrimp. The females give birth every 3 years and usually to only 1 calf. Meaning, there probably isn't a lot of them. If anyone started hunting them, they'd go extinct really quick!

Awe, aren't manatees the most cute things in the whole ocean? Alright, maybe you don't think so, but that's okay. These guys spend most of their time grazing in shallow waters no more than 7 feet deep! For being herbivores they sure weigh a lot, weighing in at anywhere from 900 to 1,200 pounds. They are usually 9 to 10 feet long, also. You'll find these guys in warmer, shallow water. Mostly along the coast of Florida. The oldest manatee in captivity is Snooty, who was born 1948. Do the math? That's 63 years old! Crazy, huh?

And did you know another name for them is Sea Cow?