Caterpillars are not pests. I know the cabbage white will make light work of your tea, the clothes moth will leave your finery in tatters and the tomato moth will munch through your ripening tomatoes, but for every one that is after your crops or clothes, there is another that brings beauty to your garden. And not just in the obvious fluttering way: those fat teenaged blue tits ganging around your garden right now are almost pure caterpillar. They are an essential part of the food chain.
Click on the link to read the rest of the article: Why gardeners should protect caterpillars | Life and style | The Guardian