NOT A LIBRARY SPONSORED EVENT. Laura Kiesel, an expert on rodenticides and their impact on wildife will give a presentation. Rodenticides kill rats, which in turn kill the birds of prey that feed on them. Waltham has lost two bald eagles and many hawks and owls to this. Laura will give information about the actions surrounding towns have taken to curtail use of second generation anticoagulant rodenticides (SGARs) and other actions to protect wildlife.