Do pesticides kill only the targeted pests?

This would all depend on the type of pesticide that you are using and what it is labeled for; Acaricide kills mites, Algicide kills algae, Avicide kills birds, Bactericide kills bacteria, Fungicide kills fungi,Herbicides kills weeds, Insecticides kills insects, Lapricide kills lamprey, Miticide likks mites, Molluscicide kills snails and slugs, Nematicide kills nematodoes, Piscicide kills fish, Rodenticides kills rats and mice.