A comment from David Attenborough
If we and the back boned animals were to disappear overnight the rest of the world would get on pretty well, but if they (the invertebrates) were to disappear the lands eco-system would collapse. The soil would lose its fertility, many of the plants would no longer be pollinated, lots of animals the amphibians, reptiles, birds, mammals would have nothing to eat and our fields and pastures would be covered with dung and carrion. These small creatures are within a few inches of our feet wherever we go on land, but often they are disregarded. We would do very well to remember them.

David Attenborough
Life in the Undergrowth

http://www.davidattenborough.co.uk/