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desert bugs - Top That! Publishing

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Which insect helps to turn over the soil<br />

There are at least 2,700 different kinds of earthworm.<br />

These amazing wriggling creatures tunnel deep into<br />

the soil, turning it over and over like a plough. This<br />

creates tunnels that supply the soil with air, and allow<br />

water to penetrate all of the time. The topsoil and sub<br />

soil also mix together, making earthworms<br />

nature’s help to gardeners.<br />

An earthworm.<br />

Why is it so hard to pull a worm out of the ground<br />

You may have watched a hungry<br />

bird busy tugging at the soil, and<br />

it’s a safe bet that there’s a tug-ofwar<br />

going on between the worm<br />

and the bird. The worm has four<br />

pairs of hooks called setae, which<br />

can stick to soil particles and<br />

make it very hard for the worm to<br />

be pulled from its hole!

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