Ziay!

sukusiva

I wish to know the distiction between mammals and rodents and also their types.

Calimecita.

Mammals are all the vertebrates that possess hair, feed their young with milk, and have a single bone in the lower jaw. There are many other exclusive characteristics of mammals, but with just those you can identify any mammal.
The members of Class Mammalia are classified into smaller groups of lower category. Order Rodentia is one of those groups; it is in fact the largest (over 40% of all mammals are Rodents). All rodents have a single pair of enlarged incisors with enamel only on the front side (that's why those teeth are chisel-like; they also grow permanently as they are worn from gnawing). They don't have canine teeth and their premolars (if they have them) and molars are usually lophodont (the surface of the tooth has parallel ridges). Most rodents (in terms of nº of species) are small animals such as rats, voles, and mice, but there are other very different, such as the South American capybara, aquatic and large as a pig, or the African porcupine.
There are two major groups of Rodents (grouped mainly on the basis of the morphology of the skull and the jaw muscles):
Sciurognathi: rats, voles, mice, gerbils; also pocket gophers, squirrels, beavers. Usually smaller. They're cosmopolite.
Hystricognathi: mostly larger rodents, including Guinea pigs, capybara, porcupines, pacas, but also spiny rats and other smaller species. From Africa and South America.

Rabbits and hares are NOT rodents.