According to the sayings, dogs and cats do not live together. And yet they have a lot in common, as they are mammals: they are covered with skin and hair, they have warm blood, they breathe light and feed the young with milk.

Moreover, dogs and cats are placental mammals, that is, they have a placenta - a special organ that allows cubs to eat when they are still in the womb.

Cetaceans

There are mammals that are so used to living in water that they have taken on the form of fish. These are dolphins, whales, sperm whales and killer whales. But they are not fish, they are real mammals. They, unlike fish, have mammary glands. These are the largest of mammals. Blue whale can reach more than 20 meters in length.

Milk

Tasty milk of a cow, goat and sheep is necessary not only for their cubs. This is the most important food for humans. Proteins found in milk and dairy products, such as cheese or yogurt, are very beneficial for both children and adults.

Interesting fact: A cow can produce many thousands of liters of milk per year. Frieson cows can produce up to 11 thousand liters. This is a real record! And from goat milk they make wonderful cheese.

Protection

Each mammal in the process of evolution developed a system of defense against enemies. Some have grown horns, others have learned to quickly run or climb trees. How is this timid little animal - a skunk protected? When he is scared, he emits a stream of foul-smelling substance. This chemical attack makes the enemies flee what urine is. Skunk lives in America.

His relative is a European stink, who, as the name suggests, has learned to defend herself in the same way.