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Machines & Inventions
Copyright © 2008 by Saddleback Educational Publishing
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• The fastest land animal is the
cheetah with a maximum speed
of 60–68 mph.
• The sloth is one of the slowest
animals and can even take up to
a month to digest its food.
• The biggest animal that ever lived
on the earth is the blue whale.
• The biggest land mammal is the
• Tallest mammal – the giraffe
• Smallest mammals – the pygmy
shrew (weighing .04–.09 oz)
and the bumblebee bat (weighing
about .07 oz)
Marsupials are pouched
mammals. They include
animals like kangaroos,
opossums, wombats, and
Primates are placental mammals.
They include human beings,
apes, monkeys, lemurs, and
prosimians or lesser primates,
such as lorises and aye-ayes.
Animals form one of the largest groups of living organisms. Scientists believe that
there may be around 30 million different kinds of animals living on the planet.
They range in size from the tiny mosquito to the gigantic blue whale. All animals
have four important characteristics: they can move, breathe,
grow, and reproduce.
of all modern
animals is believed
to be protozoa.
the earliest forms
of life on the
million years ago,
appeared on the
earth. Most fossil
finds of the earliest
belong to this
• Anthozoans were cn