What does a propane cannon do?

A propane cannon is designed to produce loud explosions that serve as a method of bird control. The noise generated by the cannon is intended to frighten birds away from specific areas, such as agricultural fields or airports, where they might pose a threat or cause damage. This deterring technique is particularly effective because the loud sounds simulate the presence of danger, prompting birds to relocate to safer environments.

In contrast, the other options involve different methods of animal control. Trapping animals is a direct approach that involves physical capture, while releasing pesticides is useful for insect control but doesn't apply to the functionality of a propane cannon. Emitting high-frequency sounds could deter certain pests, but this is not how a propane cannon operates. Thus, the primary function of a propane cannon is to create noise to repel birds effectively.