Mammals

TigerKangarooRabbit Monkey Polar Bear This is an article [] Video 1: Panda [] Video 2: Kangaroo [] Mammal Stats Mammal Characteristics Mammal Classification 1. Monotremes 2. Marsupials 3. Placental Mammals
 * Mammals are approximatley 0.3% of all living things on earth
 * Found in range of environments because they are endothermic and have diverse body plans
 * Dominant animal living in current era
 * Over 4,000 species
 * Smallest: hog nosed bat/shrew
 * Largest: Blue whale
 * Body structure
 * Body covered by hair
 * Specialized teeth for different diets
 * Canines: tearing
 * Incisors: cutting
 * Molars: grinding (especially plants; herbavores)
 * Range of foot structures
 * Walk on foot, digits, or one toe (Ex. Hoof)
 * Body Function
 * Lungs, diaphragm
 * Four chambered heart
 * Endothermy
 * Reproduction
 * Internal fertilization
 * Internal development in uterus
 * Nourishment through placenta
 * Mammary glands supply milk
 * Most give birth to live young
 * Mammals placed into 3 orders determined by reproductive methods
 * Egg laying mammals
 * Lack placenta
 * Ex. Duck billed platypus and Echidna (spiny anteater)
 * Pouched mammals
 * Found mainly in Australlia and New Guinea
 * Kangaroos, opossums
 * Short gestation period
 * Yound develop completley in uterus
 * Nourished by the placenta
 * Gestation: period of development inside the mother- 9 months
 * Much longer gestation period than other mammals
 * 95% of all mammals