post by penserstudypoint.com
There are about 5,000 species of living mammals. They are divided into three subclasses, and about twenty-six orders. Mammals display a remarkable array of adaptations that enable them to inhabit a wide range of habitats.
They range in size from the minute bumblebee bat, which measures a mere three centimetres in length, to the magnificent blue whale, which can measure 33 metres from head to tail. The main orders of living mammals are given above.
Of all the classes of animal life, mammals are considered the most advanced, and are probably the most popular class. They are the only animals that possess true hair, and have the capacity to produce milk.
Their superior brains, warm blood, and the way they care for their young have given them a great advantage over other animals in the struggle for survival.
The overall success of mammals as a group is due to their ability to adapt to virtually every environ ment on Earth. Although most species live on land, some have taken to the sea and air as well as underground.
Is it any won der that many scientists con sider mammals as the dominant animals of the world?