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Mammals
Chapter 45
Extinct species
Characteristics of Mammals • mammary glands to feed
young • body covered with hair or fur • live birth • lung breathing • endothermic • diaphragm breathing muscle • four chambered heart • seven cervical vertebrae • pectoral and pelvic girdles-
two pairs of limbs • highly developed brain
cerebrum (emotions) cerebellum (equilibrium and movement)
Endothermy
Respiratory System
Heart comparison
Fish
Frog
Mammal
Circulatory System
Nervous System
Mammal Brain
18
Mammal Orders There are 19 orders of
mammals in the class Mammalia in which 17 nourish unborn young in the placenta, egg laying mammals and marsupials
19
Monotremes and Marsupials Only 5 percent of all mammalian
species are in the orders Monotremata and Marsupialia.
20
Monotremata • Oviparous or egg laying mammals • Only 3 in existence • Duck-billed platypus and two species of spiny
anteaters called echidna. • Not completely endothermic (their body
temperature is lower and fluctuates more than other mammals)
21
Marsupials • Marsupials give birth to tiny
immature young that crawl to a pouch on the mothers belly immediately after they are born.
22
They attach themselves to milk secreting nipples nursing until they are mature enough to survive outside the pouch.
23
250 species of marsupial species exist in Australia, New Guinea, Tasmania, And the Americas
• .
Tasmanian Devil
24
American Marsupial
25
Placental Mammals
26
Characteristics of Placentals • Placental mammals carry unborn young in the
uterus until young can survive in the wild. • Oxygen and nutrients are transferred from
mother’s blood to baby’s blood
27
Placental Characteristics
• The placenta is a membrane providing nutrients and waste & gas exchange between the mother and developing young
• Gestation period-is the time which mammals develop in mother’s uterus
Classification of Mammals- teeth
foot structure
toes and fingers, claws and nails
Insectivora
Chiroptera
Rodentia
Lagomorpha
Edentata
Cetacea
Sirenia
Proboscidea
Carnivora
Perissodactyla
Artiodactyla
Primates
Anthropoids
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