Jessica Robinson, of St Mary's School, asks :-

Simon York, of King's High School, asked:-

Why do other insects stick to spider's webs but spiders dont?

Grace Hall, an arachnologist (someone who studies spiders) with Landcare's Mt Albert Research Centre, responded.

Spiders exude different types of silk. Some are sticky and some are not.

The spider knows which of the lines are sticky so avoids those. Also, during preening spiders produce an oily secretion, from the glands at the mouth, which coat their legs and this stops them sticking to their webs.