These are not just bugs but insects in general. Examples include
bugs and bats (generally insect swarms). Keep in mind that there are many other species that reproduce rapidly such as aphids, fruit flies, houseflies, mosquitoes, fleas, cockroaches, termites, ants, black flies, midges, stable flies, blowflies and flesh flies, etc. The many species that reproduce frequently are just a Google search away.
You are heavily downplaying the mass reproduction of these species and how destructive they actually are.