Mammals
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Mammals

I. Important Mammalian Features

    A. Milk production
      B. Highly developed nervous system
        C. Hair
          D. Size
            E. Feeding habits
              1. Carnivores
                2. Herbivores
                  3. Omnivores
                  F. Excretory system
                    G. Circulatory system
                      H. Reproduction
                        I. Endothermy and Homeothermy
                          1. Sources of heat
                            2. Regulation of heat exchange
                              3. Behavioral adaptions
                              J. Diaphragm
                                K. 3 middle-ear ossicles
                              II. Changes that led to Mammalian conditions
                                A. Shift in position of Appendages

                                B. Warm-bloodedness

                                C. Developed hair

                                D. Shift in air passages

                                E. Developed mammary glands

                              III. Diversification from other Animals
                                A. Extinction of dinosaurs

                                B. Intelligence

                                C. Insulation of hair

                                D. Advances in reproduction

                              IV. Mammalian System Features (Skin)
                                - Epidermal Derivatives
                                 
                                  1. Hair
                                    a. scales

                                    b. cortex

                                    c. medulla or pith
                                     

                                  2. Claws, nails, and hooves

                                  3. Spines and quills

                                  4. Horns and antlers
                                   

                                    a. true horns

                                    b. antlers

                                    c. rhinoceros horn

                                    d. giraffe
                                     

                                  5. Glands
                                   
                                    a. Musk glands

                                    b. Sebaceous glands

                                    c. Sudoriferous glands

                                    d. Ceruminous glands

                                    e.  Mammary glands
                                     

                                  6. Mammalian teeth
                                   
                                    a. Heterodont

                                    b. Diphyodont

                              V. Classification
                                A. Subclass Prototheria - extinct

                                B. Subclass Theria

                                  1. Infraclass Ornithodelphia
                                    -Order Monotremata
                                     
                                  2. Infraclass Metatheria
                                    - Order Marsupialia
                                     
                                  3. Infraclass Eutheria
                                   
                                    a.  Order Chiroptera

                                    b. Order Primates

                                    c. Order Cetacea

                                    d. Order Rodentia