MAMMALIA
CHARACTERISTICS OF MAMMALS
1) Feed milk to their young using mammary
glands
2) Produce their own body heat
3) Covered by hair
4) Young develop inside the females body
Monotremes
Characteristics of monotremes:
1) Lay eggs like a reptile
2) Feed milk to their young
when they hatch
Marsupials
Characteristics
1) Give birth to poorly developed
young
2) Young continue their
development in the
mothers pouch
Placental mammals
Characteristics:
1) Give birth to well developed
young
2) Nutrients are transferred from
mother to offspring by a mass of
highly vascularized tissue
= Placenta