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I-v)Mammals

I-v)Mammals. Julia Solis . Mammalia. Mamma: Latin Current # of living mammals: around 5,490 1 st mammal: Megazostrodon 3 types: Monotremes : egg-laying mammals ( short beaked echidna) Marsupials: born in immature state; most have pouches (Koala)

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I-v)Mammals

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  1. I-v)Mammals Julia Solis

  2. Mammalia • Mamma: Latin • Current # of living mammals: around 5,490 • 1st mammal: Megazostrodon • 3 types: • Monotremes: egg-laying mammals (short beaked echidna) • Marsupials: born in immature state; most have pouches (Koala) • Placental: born in advanced stage; nourished through a placenta (Fox)

  3. Life Cycle & Span • Birth, young mammal, adult • Born with different maturity level • Adult females reach fertility at different ages • Mothers produce milk to feed the baby • Average human life span in 1st world: 75 years

  4. Characteristics • Sweat glands and are able to produce milk • 3 middle ear bones (hammer, anvil, stirrup) • Warm-blooded (endothermic) • Have hair • Eukaryotes • Diphiodonty

  5. Characteristics • Larger and more developed brain • Vertebrates • Limbs (flippers, wings, legs and arms) • Four chambered heart • Amniotes • Single-bone jaw • Heterotrophic

  6. Diet & Digestive System • Herbivores: plants (cows, sloths…) • Carnivores: meat (lions, wolves) • Omnivores: plants & meat (people, some bears…) • Insectivores: Insects (anteaters) • Don’t all have the exact same digestive system • Basics: mouth, esophagus, stomach, intestines

  7. Nervous System • All brains have a Neocortex • Placental mammals: corpus callosum • Based on the brain and spinal cord • Divided in four parts (central, autonomic, peripheral, and somatic)


  8. Circulatory System • 4 chambered heart • Pulmonary and body circulations are independent • Oxygenated blood goes to left atrium (entrance) • Deoxygenated blood from tissues go to right

  9. Respiratory System • Ventilatory (breathing) tool (lung) • Mammals’ lungs are less efficient than birds • Ventilation causes negative pressure pump developed in diaphragm through evolution

  10. Bibliography • http://www.kidzone.ws/animals/mammals.htm • http://www.enchantedlearning.com/subjects/mammals/ • http://www.currentresults.com/Environment-Facts/Plants-Animals/number-species.php • http://www.factmonster.com/ipka/A0934288.html • http://www.bbc.co.uk/nature/life/Mammal • http://www.newton.dep.anl.gov/natbltn/400-499/nb486.htm • http://www.merriam-webster.com/dictionary/mammal

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