Why do animals have tails?

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Why do animals have tails?
Why do animals have tails?
– Kristin M., age 11, Kansas City, Missouri.
Scientists have found fossils of animals with tails dating back hundreds of millions of years.
Back then, early fish used their fanlike tails as fins to swim through oceans and escape predators.
As these fish evolved into creatures that lived on the land, their tails started to change too.
Whether they belong to reptiles, insects, birds or mammals, tails serve a wide variety of purposes.
Modern animals use their tails for everything from balance to communication and finding mates.
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A balance and movement assist.
Scientists believe that dinosaurs, including the Tyrannosaurus rex, swung their tails side to side to balance their heavy heads and bodies while walking on two legs.
This movement allowed them to run fast enough to catch their prey.
Similarly, present-day kangaroos use their tail for balance when they leap across the open land.