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Zoologist Mary Ellen Holden described the jerboa. She said its
measures about 10 centimetres (not counting its
tail). Its ears are 3.8 to 5cm long. This means its ears are 40 to 50 per cent as long as its body
. The elephant's ears are just 17 per cent of its body length. Professor Holden said: "The jerboa has the
ears for the size of its body in the
animal kingdom." Professor Holden explained why
animals have large ears. They usually live in very hot
. Large ears help an animal to keep cool in the
. Their ears are large, thin and have many tiny blood
. The blood releases heat from the body into the
, which helps the animal cool down.
