Jump Start Turn in your project On a piece of paper, answer the following: –How many chambers does a bird heart have? –In a bird, where is the food stored before it enters the stomach? –Birds are considered ectothermic or endothermic?

Mammals Class Mammalia

Characteristics Integumentary –hair, 2 pair of appendages, 5 digits, larynx with vocal cords, have a highly developed immune system to recognize and destroy pathogens

Characteristics Skeletal/Muscular –7 cervical vertebrae; Variety of limb adaptions  Can run, walk, climb, burrow, fly, swim, leap

Characteristics Circulatory –4 chambered heart, 2 separate loops, complete separation of oxygen rich/oxygen poor blood Reproductive –Dioecious – different sexes, internal fertilization, viviparous – live births, placenta, mammary glands

P 2 = slate What are at least two distinguishing features of mammals?

Characteristics Nervous –Highly developed cerebrum/cerebellum, & senses to detect and respond to stimuli. Endocrine system to regulate body activities by hormones Respiratory –Diaphragm, lungs with alveoli instead of air sacs, lungs are controlled by two sets of muscles for inhalation and exhalation

Characteristics Digestive –Complex teeth, herbivores (many have specialized digestive organs to break down plant matter), carnivores, omnivores Excretory –Highly developed kidneys extract urea and help excrete or retain water as needed

Characteristics Body Temperature –Endothermic, may also have sweat glands Habitat –Land and water

P 2 = Turn to your partner Describe how to distinguish between a herbivore and a carnivore by looking at an animals teeth.

Groups of Mammals Monotremes – egg laying, have cloaca (platypus) Marsupials – immature young develop in external pouch (kangaroo, koala) Placentals – embryo develop longer inside mother (human, dog, elephant)