1.   Many birds nest and sleep in hedges and eat insect pests.

2.   Frogs eat pests which destroy crops and carry diseases.

3.   This could happen should genetically altered plants become weeds, or should insects designed to eat certain pests develop a taste for others.

4.   Pike gardens near-organically to avoid harming butterflies and beneficial insects, such as ladybugs and praying mantises, that eat insect pests.

5.   The Black and Yellow Argiope eats pests like flies and mosquitoes.

6.   They also eat insect pests.

7.   They are beneficial, because they do eat pests, but their invasion of houses and tendency to gather all over the outside of houses is a nuisance.