Mammals



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[] article about the rise of mammals

__Body Structure__ __Body Function__ __Reproduction__
 * Mammal Information:**
 * Mammal Stats:**
 * Mammals are approximately .3 percent of all living things on earth
 * Found in range of enviroments because they are endothermic and have diverse body plans
 * Dominant animal living in the current era
 * Over 4,000 species
 * Smallest: hog nosed bat/shrew
 * Largest: blue whale
 * Mammal Characteristics:**
 * Body covered by hair
 * Specialized teeth for different diets
 * Canines: tearing
 * Incisors: cutting
 * Molars: grinding (especially plants; herbivores)
 * Range of foot structures:
 * Walk on foot, digits, or one toe (ex. hoof)
 * Lungs, diaphragm
 * Four - chambered heart
 * Endothermy
 * Internal fertilization
 * Internal development in uterus
 * Nourishment through placenta
 * Mammary glands supply milk
 * MOST give birth to live young

1. Monotremes 2. Marsupials 3. Placental Mammals
 * Mammal Classification:**
 * Mammals placed into 3 groups determined by reproductive methods
 * Egg laying mammals
 * Lack placenta
 * Ex. Duckbilled platypus and Echidna (spiny anteater)
 * Pouched animals
 * Found mainlly in Australia and New Guinea
 * Kangaroos, opossums
 * Short gestationi period
 * Young develop completely in uterus
 * Nourished by the placenta
 * Gestation: period of development inside the mother
 * Much longer gestation period than other mammals
 * 95% of all mammals