When I think of pests I think of the usual ants spiders and flies. But I was looking at this differently. If I had a insect problem do my neighbors as well. 

One neighbors said he had a scorpion problem. I do not. Why I ask myself?

Does anyone remember the old story. There was an old lady who swallowed a fly?

This story has great weight when it comes to pests.

If you kill a lesser pest another surly will take it's place.

This also can be identified in the bible revelations 9 I believe. They took locusts dressed them in armor and had them battle scorpions. Without the armor a locusts easily could kill the scorpion. But without flight scorpions have a greatly increased chance of consuming.

This was fun in biblical time making toys out of pest not making plagues for ourselves. To co habitats rather than consume till we are the prey next to fall.