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Wonders of the real world

Wonders of squirrels

Squirrels (the family Sciuridae)

The real squirrel family

Squirrels belong to a big family of animals with large front teeth. Here are three true things about them.

A shady tail

The word squirrel comes from an old Greek word made of 'shade' and 'tail'. It refers to the long bushy tail that many squirrels have.

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Hundreds of kinds

There are some 285 species of squirrel. They are native to the Americas, Europe and Asia, and Africa, and people took them to Australia.

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Teeth that keep growing

Squirrels have large front teeth for gnawing. These teeth grow throughout the squirrel's life.

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A grey squirrel climbing headfirst down a tree trunk, its back feet turned round to grip the bark.

A squirrel climbing headfirst down a tree, back feet turned round

Headfirst

How a squirrel runs down a tree

Most mammals cannot climb down a tree headfirst, but tree squirrels can. Their feet help. In most squirrels the back legs are longer than the front legs, and every squirrel has four or five toes on each foot. The feet have soft pads underneath, and strong claws for gripping and climbing. The real trick is in the back legs. A tree squirrel can turn its ankles right round, by 180 degrees. Then its back feet point backwards, and they can grip the bark from the other direction. Squirrels also have large eyes and excellent vision, which is especially important for the squirrels that live in trees.

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Big and small

Tiny squirrels, giant squirrels and busy tails

Squirrels come in many sizes. At one end are the African pygmy squirrel and the least pygmy squirrel. They are only 10 to 14 centimetres long from nose to tail tip, and weigh just 12 to 26 grams. At the other end is the Bhutan giant flying squirrel, at up to 1.27 metres long. Big or small, a squirrel's tail does many jobs. It can keep rain, wind or cold off the squirrel. It can help it cool down when it is hot. It works as a counterbalance when the squirrel jumps about in trees, and as a parachute when it leaps. Squirrels also use their tails to signal.

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Three remarkable squirrels

A large maroon, black and cream squirrel with a long tail sitting on a branch in a tropical forest.

An Indian giant squirrel on a branch in a tropical forest

Indian giant squirrel

Ratufa indica

This large tree squirrel lives only in the forests and woodlands of India. Its fur can be cream, tan, rust, maroon, brown or black, and it travels from tree to tree with jumps of up to 6 metres.

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Southern flying squirrel

Glaucomys volans

Flying squirrels do not really fly. They glide, using a furry flap of skin that stretches from the front legs to the back legs. Just before reaching a tree, this squirrel raises its flat tail to change direction sharply upwards.

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A small brown ground squirrel standing upright beside its burrow on the tundra.

An Arctic ground squirrel beside its burrow on the tundra

Arctic ground squirrel

Urocitellus parryii

This squirrel lives on the tundra of Alaska, northern Canada and the Russian Far East. It hibernates for seven to eight months, and its body temperature can fall as low as minus 2.9 degrees Celsius.

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The pictures on this page are AI-generated illustrations. The facts are checked against the sources linked.