Mammals

Mammals Info: · Mammals are approximately 0.3% percent of all living thing on earth · Found in range of environments because they are endothermic and have diverse body plans · Dominant animal living in the current Era · Over 4000 species  - Smallest: hog nosed bat/ Shrew  - Largest: Blue Whale Mammal Characteristics · Body structure  - 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) · 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 Mammal Classification · Mammals placed into 3 orders determined by reproductive methods 1. Monotremes -egg laying mammals -lack placenta -ex. Duckbilled platypus and Echidna (spiny anteater) 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  o Much longer gestation period than other mammals  · 95% of all mammals

Siberian Tiger Information. Basic Info.

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 * Below are some animals, that are under the mammals classification, they have lungs, one way digestive track, and other key characteristics that prove that these animals are mammals.**