How are mammals different vertebrates?

Originally Answered: What are two ways in which mammals are different from all other vertebrates? I can easily give five: Three little bones in the inner ear; Complex teeth; Females produce milk. Hair rather than scales or feathers. Defective colour vision. The first two are shared with some extinct relatives. read more

Mammals are a sub category of vertebrates. Vertebrates are animals with an internal skeleton. Mammals bear live young, have hair or fur, are warm-blooded, & breastfeed their babies. Non-mammalian vertebrates include birds, reptiles, & amphibians. read more

Mammals (class Mammalia /məˈmeɪli.ə/) are a clade of endothermic amniotes. Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). read more