2.  Quadrupeds are
animals with two feet, such as birds.
animals with four feet, such as cows.
animals with six feet, such as flies.

3.  Pinnipeds are
aquatic mammals with flippers, like seals and walruses.
land mammals with claws, like tigers and lions.
land mammals with hooves, like donkeys and sheep.

4.  Bipeds
like elephants and camels, have two humps.
like cows and camels, have two stomachs.
like humans and gorillas, walk upright on two legs.

5.  Marsupials are mammals, such as
opossums, whose females carry their young in an external pouch.
whales, whose females bear their young in water.
the platypus, whose females lay eggs.

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