Dolphins, along with whales are mammals, and are supposed by researchers and historians to be the remnants of land mammals, which entered the water to live several million years ago. Dolphins have residual legs near where the tail meets th...

The Gray Whale is a baleen whale. What this means is that they have two blow holes and special plates that they can use to filter their food. Gray Whales are extremely large in size, and grow to as long as 45 feet. Gray Whales make an incredible mi...

The killer whales today evolved from mammals that had four legs. Inside the flippers of the whales is a bone structure typical of a four-legged animal's foreleg and paw. Leg bones, unseen by us, are there buried in the flesh of whales. The tai...

Some say the humpback whale is fifty feet long, others that it is more like sixty-five feet long. Either one is a pretty impressive length. Their flippers are very large also, from three feet wide to possibly 16 feet long.

That is a nice size fl...

The sea otter is one of the very smallest marine mammals, and spends most of its life in the sea.
Males weigh about 100 pounds and are about five feet long, while the females are smaller weighing about 60-75 pounds and measure just about 3-4 fee...

Platypus is mostly prevalent to Eastern Australia in Tasmania. It is a semi-aquatic mammal. It is one of the five species of monotremes. They are known as the only mammals that lay eggs rather than giving birth to the juvenile. In short, it is...

Known for being the largest pinniped as well as the biggest member of the Carnivora order, the elephant seal is one of just two species of the animal.  This species was named for its massive size as well as the big proboscis that is seen on the adu...

The Yangtze River Dolphins were at one time widely spread and were found in one place only.. in the three gorges that live in the mouth of the Yangtze River of China The Yangtze River Dolphin can grow to be as large as a large man, one of the bigges...

The name given to these guys just about says it all. Fur seals are beautiful marine mammals that have been hunted for the fur they are wearing, so that someone else could wear it too. They have a lovely coat of very fine and thick hair that is well...

The Amazonian manatee is the only fresh water manatee in the world and is found only in the Amazon river basin. This unique species of manatee is currently classed as vulnerable and the exact population numbers are unknown. The last populat...

The Dugong or otherwise known as the 'sea cow' is a mammal that lives exclusively underwater and has close genetic ties to the elephant despite its appearance. The Dugong feeds only on sea grass found on the ocean and this is one of the reasons...

The Franciscana is one of the worlds smallest dolphins and can be found off of the east coast of South America. These bashful dolphins share many physical traits with river dolphins despite the fact that they are not closely related at all. T...

Like all whales, the Sperm Whale is a mammal, with it's natural habitat in the seas and they can be seen in every ocean of the world, in both topic and cool oceans. It can grow up to 20.5 metres (67 ft) and is the largest toothed animal in the world....

The Eurasian Water Shrew known by the brits simply as the Water Shrew is a fairly common rodent. It usually grows to be up to 10 centimeters (4 in) long. Its tail can be up to 75% as long as the shrew itself. The fur of this rodent traps bubbles of ai...

The American Manatee may not be one of the most beautiful animals, but they are one of the few mammalian species that eat underwater vegetation. Having suffered greatly from hunting, the manatees are currently one of the most endangered se...

Leopard Seal lives in the freezing Arctic waters, also it can wind up in territories far more to the north like South America, New Zealand and Australia. Leopard seals spend most of the time in the water. Sometimes they abandon water and appe...

The Muskrat is sometimes confused with a young beaver, because they have a similar appearance and swimming styles. The Muskrat can, however, be distinguished by its long, massive tail, which is covered in scales. The tail can be as long as t...

California Sea Lion is one of the most the most elegant underwater mammals. Its swimming style, changing direction frequently, looks almost like and underwater flight. These sea mammals are excellent swimmers — they can reach a speed of m...

The Giant otter is one of the rarest freshwater otter species and they grow to a size of a massive one and a half a metre length, not including the tail. These large creatures live in Brazil, Guiana. Small but dying populations also inhabit Arg...

Looking similar to a dolphin, the bottlenose whale has 2 different types of whale species. These 2 different whale species are the northern bottlenose whale (Hyperoodon ampullatus) and the southern bottlenose whale (Hyperoodon planif...