Which of the following targets avicides specifically?

Avicides are substances specifically designed to control or eliminate bird populations that may be considered pests or carriers of disease. These agents work by targeting physiological aspects unique to birds, leading to their immobilization or death while ideally having minimal impact on other non-target species. Since the question asks about what avicides specifically target, bird species is the most accurate answer.

In contrast, the other options present non-target species: insects and their larvae are the focus of insecticides, not avicides; bacteria and pathogens would be addressed by antibiotics or disinfectants; and fish and aquatic organisms fall under the scope of piscicides. Hence, the correct identification of the target of avicides as bird species illustrates an understanding of pest control classifications and their specific applications.