Why Do Rabbits Have Long Ears?

Answer

Rabbits have long ears to help them loose heat as their body temperatures are usually quite high, around 40 degrees Celsius. This is done by circulating blood through a large vein that runs through their ears helping them cool their bodies.
1 Additional Answer
Rabbits have long ears because they are prey animals. Their long ears amplify sound so that they can run if a predator approaches. They are an early warning system. You can find more information here: http://www.4to40.com/Qa/print.asp?id=749
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