Which of the following is NOT a method of controlling birds?

The correct answer points to the fact that not all listed methods are legitimate or acceptable approaches to controlling bird populations. Shooting and poisoning involve direct harm to the birds and can have negative ecological consequences, such as disrupting local ecosystems or inadvertently harming non-target species.

Sanitation, on the other hand, is an indirect method of control that focuses on removing food sources and nesting areas to deter birds from inhabiting certain locations. This method is generally more humane and environmentally responsible because it does not involve killing the birds but instead encourages them to find alternative habitats by making the area less appealing.

In this context, the question highlights the importance of understanding various control methods, where some may be regulated or prohibited due to ethical or environmental concerns, distinguishing them from more humane and effective solutions like sanitation.