The heaviest animal in the world is recognized as a representative of the mammalian class - the blue (blue) whale. The dimensions of its body reach 35 meters in length, and its weight is 200 tons. The dwarf shrew, or Etruscan shrew, is recognized as the lightest and smallest animal (and not a microorganism) on Earth. With a length of 3 centimeters, this baby weighs only 2 grams.
Blue whale. The blue (or blue) whale is the largest and therefore the heaviest animal on Earth. Currently, the officially recorded maximum weight of this giant is 195 tons, but scientists say that certain species weigh more than 200 tons! These whales are 35 meters long. Scientists have recorded the weight of some organs of these sea heavyweights. For example, the tongue of one caught female blue whale weighed 4.22 tons, and the heart - 698.5 kilograms. The cubs of these giants are the largest newborn cubs in the world. It is curious that newborn whales already from the first days of life weigh about 3 tons, reaching 7 meters in length.
The speed with which blue whales grow and develop is also amazing. During the first year of life of a two-ton kitten, its weight increases 30 million times! This is considered the highest growth rate in the entire world. The blue whale is not only the heaviest and largest animal on Earth, but also the loudest. The sounds he makes during his communication can be heard even from 850 kilometers away. If we compare the blue whale with the largest land animal - the African elephant, it becomes clear that the first one weighs exactly 20 times more than the second! Surprisingly, these sea giants feed on tiny organisms such as crustaceans and plankton.
Shrews. Shrews are recognized as the smallest animals on earth and the lightest. But not all, of course, but only two species: the tiny shrew and the dwarf shrew (Etruscan shrew). Shrews are small mammals that resemble mice in appearance. In fact, they are relatives of hedgehogs, desman and moles. This is understandable: shrews are not rodents, but insectivorous animals that belong to the same class of the same name with all of the above "relatives". The tiny shrew is the smallest and lightest animal inhabiting Russia and Transbaikalia. This baby weighs only 2 grams, and the length of its body is up to 5 centimeters.
The lightest and smallest creature on Earth is another shrew - the pygmy shrew. Its weight is no more than 2 grams, and the body is about 3 centimeters long! Due to their small size, these crumbs require a lot of energy, which means a lot of food. They feed disproportionately to their weight and cannot remain without food for more than 2 hours. The diet of the world's lightest vertebrates is made up of invertebrates, plant foods. It is worth noting that not all shrews are small animals on the planet. There are also quite large species among them. For example, the giant shrew is considered the largest shrew in the world. Her body weight is 100 grams, and her body length is 18 centimeters.