Mammals, Milk producing animals with highly advanced brain.

What is up? Guys! i hope you are doing great wherever you are. Today we are going to take a cursory look at the general characters of the class Mammalia that include the highly advanced animals, it is believed that mammals have evolved from Cotylosaurs (Mammal like reptiles) for that they put up the example of a fossil animal called Varanope. I think we need to get down to the topic we have to discuss today.

The study of mammals is called Mammalogy, They have hair on their bodies but some of them have scales and spines like pacupine and pangolin. Their skin has sweat, scent, sebaceous and mammary glands. Females feed milk by their mammary glands to their young ones. They are warm blooded with external fleshy ears and middle ear having three bones. Their limbs are pentadactyl. They have 4 chambered heart with double circuit circulation and non nucleated RBCs. They respire by lungs with the assistance of ribs and diaphragm. Their brain is highly developed with cerebrum and cerebellum. Males have testes outside their bodies inside the scrotum. They have internal fertilization and development is also internal inside the uterus. They have two sets of teeth, Milk teeth are replaced by the second set. They have 12 pairs of cranial nerves and 31 pairs of spinal nerves. I think i should conclude the topic here because it seems lengthy to me and i may cause discomfort to you while reading.