Passage Summary: Even though bug zappers are great at zapping bugs, pest control pros tell people not to use them and suggest using insect-eating birds or chemicals instead.

Reasoning: Bug zappers effectively kill flying insects, yet pest control experts advise against them in favor of birds or sprays.

Analysis: The paradox here is the tension between the device's effectiveness and the experts' rejection of it. To resolve this, we need a piece of information that explains why a 'very effective' tool might actually be a bad choice. Look for an answer that reveals a hidden downside to zappers, such as them killing beneficial insects or actually attracting more pests to the area than they kill.