placental mammals

1. Placental Mammals
Chapter-6 Section-3

2. Objectives
• What is placental mammal?
• Explain the gestation period.
• Give an example of each type of
placental mammal.

3. Lets watch a video.

4. Placental mammals
• Placental mammal is a mammal whose embryos
develop inside mother's body.
• The embryo grow in an organ called the
uterus.
• Gestation period in mammals: the length of
time between fertilization and birth.
• Elephants need 23 months!
• Mice need only a few weeks!
• Human need 9 months.

5. Placenta
• An organ called placenta attaches embryo to
the uterus.
• Placenta carries oxygen and food from the
mother’s blood to the embryo and carries
wastes away from the embryo.

6. Anteaters, armadillos, and sloths

7. Insectivores
moles, hedgehogs

8. Rodents
squirrels
chinchillaporcupine

9. Rodents
• The capybara of south America is the largest
rodent in the world.

10. Rabbits and hares

11. Homework
Section review
Page 119
Homework
For next week

12. Next lesson
Conti…on
Other types of Placental Mammals