Class – Mammalia
👉They are found in a variety of habitats – polar ice caps, deserts, mountains,
forests, grasslands and dark caves.
👉Some of them have adapted to fly or
live in water.
👉The most unique mammalian characteristic is the presence
of milk producing glands (mammary glands) by which the young ones
are nourished.
👉They have two pairs of limbs, adapted for walking, running,
climbing, burrowing, swimming or flying
👉The skin of mammals is unique in possessing hair.
👉External ears or pinnae are
present. Different types of teeth are present in the jaw. Heart is fourchambered.
They are homoiothermous. Respiration is by lungs. Sexes
are separate and fertilisation is internal. They are viviparous with few
exceptions and development is direct.
👉Examples:
👉Oviparous-Ornithorhynchus (Platypus)
Viviparous
👉Macropus (Kangaroo),
👉Pteropus (Flying fox)
👉Camelus (Camel)
👉Macaca(Monkey)
👉Rattus (Rat
👉Canis (Dog)
👉Felis (Cat),
👉Elephas (Elephant),
👉Equus (Horse
👉Delphinus (Common dolphin
👉Balaenoptera (Blue whale),
👉Panthera tigris (Tiger),
👉Panthera leo (Lion).
