Mammals

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These Zebras must learn how to run right after birth so they can survive after the first few days. Most don't live. This shows the importance of their natural abilities for survival.

media type="custom" key="8858342" An unknown rainforest was found in Africa where they have found many gorillas which are said that humans have evolved from monkeys/gorillas.







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Mammals Stats
 * 0.3% of all living things on Earth.
 * Found in many environments because they are endothermic.
 * Dominant animal living in the current era
 * Over 4,000 species

Mammal Characteristics Mammal Classification
 * Body structure
 * Covered by hair
 * Specialized teeth for different diets
 * Canines: tearing
 * Incisors: Cutting
 * Molars: Grinding
 * Body Function
 * Lungs, diaphragm
 * 4 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 groups determined by reproductive methods


 * 1) Monotremes
 * Egg laying mammals
 * lack placenta
 * EX: Duckbilled platypus

2. Marsupials
 * pouched mammals
 * found mainly in Australia and New Guinea
 * Kangaroos, opossums
 * short gestation period

3. Placental Mammals
 * 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