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Mammals

Mammals. General Characteristics. Endothermic Warm- Permits high level of activity at (regardless of outside temperature) Females have Function: About Ex: cats, dogs, humans, dolphins, elephants, kangaroo, whale, bat, rabbit, beaver, wolf, seal ,. General Characteristics.

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Mammals

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  1. Mammals

  2. General Characteristics • Endothermic • Warm- • Permits high level of activity at (regardless of outside temperature) • Females have • Function: • About • Ex: cats, dogs, humans, dolphins, elephants, kangaroo, whale, bat, rabbit, beaver, wolf, seal,

  3. General Characteristics • High • Body • In some, hair is reduced in size – • All have an integument • Contains: sweat,

  4. General Characteristics • Breathe • Excrete • Separate • Young (made by the mammary glands) • Many • These are areas from which individuals of the • Will often resort to

  5. classification • Rodents • Ex: mice, squirrels, • Have two razor • Lagomorpha • Ex: rabbits, • All • Hominids • Ex: humans, gorilla, • Insectivora • Ex: • Diet

  6. Classification • Carnivora • Ex: weasels, seals, walruses, dogs, • Highly • Contain teeth • Proboscidea • Ex: • Largest of

  7. Classification • Perissodactyla • Ex: horses, donkeys, • Often referred to as • Cetacea • Ex: dolphins, • Limbs are modified • Live in

  8. Movement and response • Skeleton • Skeletal/bone make-up allows for: • High- • Swimming • climbing • Movement of digits (fingers/toes) to • Joints allow for

  9. Movement and response • Hair: • Has • Purpose of hair: • Spines of porcupines— • Hair of most animals— • Vibrissae (whiskers)— • Slightest movement indicates

  10. Movement and response • Moveable • Fleshy • Well-developed • The largest brain in • Cerebrum - • High evolved brain allows for highly developed memory and capacity to

  11. Movement and response • Highly elaborate • Provide mammals with a high level of • Senses: taste, smell, • Most have • Many • Many will use • Ex:

  12. Digestion and Eating • Teeth • Mammalian teeth are both • Mammals are • Specialized for variety of functions: • Includes: grind, stab, scissor,

  13. Digestion and Eating • Teeth, cont. • Teeth in mammals come in • Incisors, • Not all • Use this variety to eat • Most placental mammals have between 20 and 40 teeth, while most • As a general rule animals that feed on insects have more teeth than

  14. Digestion and Eating • Contain a • Separates air passageway • Allows mammals to hold (and partially break down food) in

  15. Digestion and Eating • Have many • Insectivores are • Herbivores have • Groups: • Have large molars • Carnivores have • Adapted for • Other adaptations: • Ruminants (cattle, bison, goats)

  16. Digestion and Eating • Energy and Wastes • Require much energy • Produce a variety of • Digestive tract • If mammals eats only • Why? takes longer to • If eat only meat,

  17. respiration • Require a • 2 organ adaptations for this: • Diaphragm: • Muscle that contracts and therefore • Four-chambered heart: • Separates blood into

  18. Life cycle • All have • All have • 3 groups of Mammal life cycles: • Marsupials:

  19. Life cycle • Placental: • Develop inside • % of mammals are this • Placenta—organ which allows for nutrients,

  20. Life cycle • Placental, cont.: • Gestation period—time that embryo • Humans: 9 months, Elephants: , Mice: • Mammary gland—young • Ex: humans, dolphin,

  21. Life cycle • Marsupials: • Give birth to small, immature young that • Mothers can move around and look for food • Ex: kangaroo, • Monotremes: • Mammals that • Incubate • Ex:

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