Animals like Mammals or formally known as Mammalian is a class of vertebrate animals. Its name is derived from their distinctive feature, the mammary glands, with which they feed their young. Living mammal's species can be identified by the presence of sweat glands, including those that are specialized to produce milk. Mammals have almost the same distinguishing features and characteristics to humans. They are known as the warm-blooded animals, covered with hair and we like to think of ourselves as the best mammal around because humans have all the advantages through our intellectual mind. However, in many categories other animals have us beat, paws down. The following are the top list of class mammalian:

The Biggest

Blue Whale is a massive creature that survives on plankton. Weighing 150 tons, the blue whale is the largest animal known living creature. Their ability to maintain life on such a grand scale is aided by its oceanic lifestyle. Their vegetarian eating habit supports them to live a large life-form.

The Smallest

Kitti's Hog-nose bat or Bumblebee bat truly earns its title because it is only measuring 1.14-1.3 inches and weighing 0.06-0.07 ounces. While the smallest land mammal, the pygmy shrew is only slightly larger, tilting the scales at a heft 0.05-0.09 ounces. They are so small that they're outweighed by two standard paperclips. Even though their diminutive stature places them eye to eye with many snails and insects, these two smallest animals are true warm-blooded vertebrates: they can produce milk and they are covered with hair.

The Fastest

As might be expected, the mammal in this category depends on the terrain. And because they are living on different type of lifestyle mammals each domain requires different types of locomotion skills.

The known fastest air mammal is the big brown bat, which can flap its way up to 15.5 miles per hour. While the fastest water mammal is the killer whale that can reaches a significantly higher 34 miles per hour. And of course we cannot forget the land creature which is the titled as the overall fastest mammal, the cheetah. It can run as fast as 70 miles per hour and due to the amazing amount energy they need, this mammal can pour on their power only for a short period of time but a little period is enough for them to regained strength for another run.

The Slowest

In a competition over slowness, there are three animals come to our mind: the tortoise, the sloth, and the snail. Definitely the snail is the slowest of them all. The garden snail clocks in at a molasses-like 0.03 miles per hour. Not because of their size and weight but by moving at a steady pace, it would take the snail 12.5 hours to go around a standard city block.

The Thickest

And lastly, this category titled to the rhinoceros, the land mammal with the thickest skin of any animal. It has 1-inch-thick skin and rough boss.

Mammals are the closest living creature to humans, and they are called extremes because of their distinctive features. Like Humans they also need to survive living in this earth.