1. MONOTREMES “Egg laying”
Duckbilled Platypus
Anteater
Echidna

2. MARSUPIALS Premature babies develop in pouch
Found in Australia/New Guinea
Kangaroo
Wallaby
North America
oppossum

3. PLACENTAL Embryos nourished inside mother by placenta
95% of all mammals are placental

4. Ways offspring enter world
OVIPARITY- Reproductive tract encloses egg in tough protective shell
Eggs deposited outside body to hatch
EX: Reptiles & birds & mammals (monotremes)

5. Ways offspring enter world
VIVIPARITY-
No shell around egg
Eggs retained in body
Nourished by mother through placenta
Offspring are born alive
Ex: mammals & some reptiles

6. Ways offspring enter world
OVOVIVIPARITY- Eggs laid shortly before hatching or hatch inside female Nourishment inside mom comes from egg yolk not mother
Ex: Some reptiles (snakes)

7. SHELL? NO SHELL? Embryo grows? Food comes from? Seen in? SHELL
OVIPARITY
OVOVIVIPARITY
VIVIPARITY
SHELL?
NO SHELL?
Embryo grows?
Food comes from?
Seen in?
SHELL
NO SHELL
SHELL
OUTSIDE
INSIDE
INSIDE
SHELL
EGG
EGG
MOTHER
Birds,
Reptiles,
Few mammals
Mammals,
few reptiles
Reptiles