Thursday, 15 November 2012

2.1 Animals Reproduce

1) Animals reproduce by giving birth or laying eggs.

2) Most mammals give birth to live young.
    (a) Some animals such as dogs, cats and rats give birth to many offspring.
    (b) Some animals, for example, the cow, elephant, rhinoceros and whale give birth to only one     
          young at a time. The calves of cows and elephants grow in the wombs of their mothers until
          they are born.
    (c) The animal babies feed on milk from their mothers' mammary glands.
    (d) Mammals take care of their young until the young are mature and able to take care of
    (e) The only mammals that lay eggs are the duck-billed platypus and the spiny anteater.

3) Amphibians, birds, reptiles, fish and insects reproduce by laying eggs.
    (a) Some animals lay many eggs while some lay only a few eggs at a time.
    (b) Frogs lay thousands of eggs on the surface of water. Tadpoles hatch from these eggs.
    (c) Hens. ducks and birds lay a few eggs at a time. Chicks hatch from the eggs of a hen.
    (d) Some animals do not take care of their eggs or young. Other animals only take care of their  
          eggs but do not take care of their young.

4) Animals can be classified according to the way they reproduce.


Rabbits, hamsters, squirrels, goats, orang-utans, giraffes, lions, elephants, pandas, bears, seals, kangaroos.

A leopard and its cubs
A Whale and its calf


Snakes, crocodiles, lizards, tortoises, snails, bees, butterflies, cockroaches, grasshoppers, penguins, sea horses.


A turtles and its eggs.          

A platypus. 

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