True or False: Insect Growth Regulators (IGRs) are generally harmless to animals.

Insect Growth Regulators (IGRs) are designed to interfere with the normal growth and development of insects, particularly targeting their hormonal systems. These compounds are specifically formulated to affect the molting and reproductive processes of insects, making them very effective in controlling pest populations. One of the key characteristics of IGRs is their selective toxicity; they primarily affect insects and are generally considered safe for other animals, including mammals, birds, and reptiles.

This selective safety is crucial for integrated pest management strategies, as it allows for pest control without adversely impacting non-target wildlife and beneficial insects. While it's important to note that there may be some exceptions based on specific formulations or concentrations, the general consensus in the field is that IGRs pose minimal risk to non-target animal species, supporting the assertion that they are usually harmless to animals.