MAMMALS

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MAMMALS
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all MAMMALS have
air sacs?
diaphragm?
feathers?
nursing young?
hundreds of babies at once?
scales?
different teeth?
hair?
3-chambered hearts?
rows of teeth?
ability to learn?
4-chambered hearts?
glands?
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MAMMAL CHARACTERISTICS

• Hair covers body for insulation
• Endotherm (4-chambered heart energy)
• Diaphragm to move air in/out of lungs
• Mammary glands produce milk
• Differentiation of teeth
• Internal reproduction with placenta
• Large and complex brains
• Adapted limbs (walk/run/swim/fly/burrow/climb)

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3 Main Mammal Groups

• 1) MONOTREMES
• egg-laying mammals
• Only two remain

Platypus
Spiny Anteater
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3 Main Mammal Groups

• PLACENTAL MAMMALS
• placenta organ of exchange for mother baby
• 18 orders of placental mammals

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Order Insectivora
moles
hedgehogs
shrews
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Order Chiroptera
Bats
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Order Carnivora

• Cats-dogs-wolves-foxes-bears-otters-mink-
• weasels-skunks-seals-walruses-sea lions

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Order Edenta

• Sloths-anteaters-armadillos

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Order Rodentia

• squirrels-beavers-rats-mice-hamsters-porcupines-gu
  inea pigs

3000 species
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Order Lagomorpha

• rabbits-hares-pikas

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Order Primates

• lemurs-monkeys-apes-humans

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Order Perissodactyla

• horses-zebras-tapirs-rhinoceroses

Hoofed herbivores with odd digits
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Order Artiodactyla

• cattle-sheep-pigs-deer-giraffes

Hoofed herbivores with even digits per foot
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Order Proboscidea

• Elephants

mammoth mastodon extinct
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Order Sirenia

• sea cows and manatees

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Order Cetacea

• whales-dolphins-porpoises

The blue whale is the largest animal ever!
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3 Main Mammal Groups

• MARSUPIALS
• babies are born early, then enter pouch
  (marsupium) for further development