Mammals

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Biologists have conducted various scientific research to show that mammals - from cats, dogs to humans take pleasure in caressing and grooming one another in order to keep fur and hair free of parasites. In fact, the scientific researchers have made use of mice to carry out their research. Hence, scientists have observed that there are certain types of neurons or nerve cells in the hind legs of the mice which are activated when stroked. The researchers have also advanced that these nerve cells are not covered by a protective fatty sheath unlike pain-detecting neurons. Subsequently, the neurons linked to strokes causes the nerve impulses to the brain to be transmitted at slower speed than usual. Ahead of all, biologists have underlined that the stroking of the skin produces a pleasurable sensation in many mammals including humans. In the field of science and research, it used to be unclear which neurons detected that stimulus until now! Moreover, according to researchers there are about 4,000 kinds of mammals...