We can be specific when it comes to the terms or we could just use what we want to use. but as we live on this earth where we have to get right something so we also have to find what is the true and not or what should be used instead of the present one. We can also listen to the words mammals and animals but we may not know what exactly is the reason why one is called mammals and one is called animals.
It was written that all of the animals are considered or belonging to the group of mammals. But it could not be vice versa. There are animals that could not fall into the category as being mammals. that is because there are the criteria on what should be called mammals or animals only. The criteria that distinguish the mammals is that they have the mammary glands and not all of the animals have it. That is why those who do not have it, even if they are animals cannot be called a mammal.
That is why humans also are classified as mammals as we have the mammary glands and also one of the characteristics of mammals is that they have hair or fur that grows from the skin. There are more classifications of the created beings on this earth like fish, reptiles, or birds. Ths diversity makes the place on this earth a great and exciting place to be able to live and survive.
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