Seven major characteristics distinguish the 4500 unique species of mammals from other animals mammals are airbreathing warmblooded and have a backbone but these traits alone do not set them apart them from all other animals.
Span classnews_dtsep 08 2013spannbsp018332some people in this day and age still think animals just means mammals or just mammals and reptiles or just mammals and reptiles and birds or just mammals and reptiles and birds and amphibians or just mammals and reptiles and birds and amphibians and fish.
Here we have simply stated out facts about mammals then the distinctive characteristics of mammals and at last we have done the most common type of classification of mammalswith links to the articles about each mammal.
According to the university of michigan museum of zoology there are only three characteristics unique to mammals the three characteristics are mammary glands hair and three middle ear bones other characteristics often thought to be unique to mammals are found in other species including birds insects and reptiles.
Other characteristics mammals possess other characteristic that are different from other animals but they are all not so apparent diaphragm is a muscular wall that is used to separate the heart and the lungs from the stomach.
Mammal characteristics hair on the body suckling their babies and a single jawbone on each side are the identifying mammal characteristics to know more about this group read this animalsake article.
Animals not falling into these categories are not mammals in the world today there are more than 4000 species of mammals on land and in the water the largest known mammal is a blue whale which can weigh more than.
Mammal mammal a vertebrate animal in addition to these characteristic milk glands mammals are distinguished by several other unique features hair is a typical mammalian feature rapid evolution of secondary sexual characteristics including size can take place in a species with such a social structure.