What does a screamer do?

A screamer is a device designed to emit loud whistle-like sounds that are specifically intended to manipulate the behavior of birds, effectively repelling them from certain areas. This device takes advantage of the natural aversion that many birds have to loud and unpredictable noises, which can signal danger. By producing a continuous and unsettling noise, the screamer discourages birds from foraging or nesting in areas where they may cause damage or nuisance.

The other options do not accurately describe the function of a screamer. For instance, while a loud explosion might scare some animals, it isn't a standard feature or purpose of a screamer. Similarly, a screamer is not used to trap small animals, nor does it emit sounds that attract animals; its primary utility is to drive them away, particularly in settings like agricultural fields or urban environments where birds may become problematic. Understanding these specific functions helps to clarify the role of different wildlife control methods in managing nuisance species.