What is the difference between a cow and a caterpillar? The question seems very silly because the difference is very explicit. Mammals are special because they are the most advanced of all the different classes of animal life. They are also the animals that we know best, because most of our pets, from dogs and cats to squirrels and rabbits, are mammals.
Mammals are one of the commonest animals as they are found almost everywhere, from the Arctic snowfields to burning deserts and from tropical jungles to lofty mountains. Mammals are the ruling animals of the world today.
Mammals live on land, at sea, in the air, and even underground. All mammals, from bats to whales, share a number of important traits that make them different from other animals. Mammals are warm-blooded, they have fur or hair, and most mammals give birth to live babies—rather than laying eggs. Mammals are superior to all other animals in the care and protection of their young. The female nurses the babies with milk that is produced by special glands called the mammary glands. In fact, they are the only animals that produce milk. Naturally, this makes them truly special!
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