When using a strychnine bait for ground squirrel control, what is required to protect non-target species?

Using strychnine bait for ground squirrel control requires careful consideration to minimize the risk to non-target species. The option that correctly emphasizes this aspect focuses on the application of the bait underground.

Applying the bait underground is crucial because it helps to limit the exposure of non-target animals—such as birds, pets, and other wildlife—to the toxic effects of strychnine. By placing the bait where only the target species, in this case, ground squirrels, can access it, the potential for accidental poisoning of other animals is significantly reduced.

This method of application is particularly important with highly toxic substances like strychnine, which can pose serious risks to a variety of non-target wildlife and domestic animals. Therefore, using it underground is a responsible and effective practice for managing the risks associated with this pesticide.

Other options, such as applying it above ground or allowing it to ferment, do not provide the necessary safeguards for non-target species and could lead to increased risks of unintended exposure. Using bait stations near nests could still pose a threat as other animals might access the bait, while fermentation does not directly relate to protecting non-target species.