The ear is the part of the body that lets people hear. Some animals, like people and most vertebrates, have two ears, but some animals do not hear through ears. Spiders have small hairs on their legs that they can hear with.
The part of the ear that sticks out and can be seen is called the pinna.
Ears are also used in other ways. Elephants use their large ears to cool themselves when it is very hot. Bats rely on their ears to find prey. Some animals use their ears for signalling to each other.
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