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The animal kingdom is huge. It contains more
than a million species.
Most are small - much smaller than your eyes can see. But a few, like elephants
and whales, are giants. All animals have one thing in common. They cannot make
food. They need to eat plants or other animals to survive. All animals also
need oxygen to survive. Animals include everything from ants, spiders, and
worms to fish,
cats, and humans.