Insectivore

Lore & Background

Initially piscivores with sharp conical teeth, their tooth arrangement also suited eating animals with exoskeletons, allowing insectivory to stem from piscivory. At one time, insectivorous mammals were classified in the order Insectivora, but this order is now abandoned because not all insectivorous mammals are closely related; most taxa have been reclassified, with those not yet reclassified remaining in Eulipotyphla.

Reader's Guide

Insectivores play a critical role in ecosystems by controlling insect populations and recycling nutrients. Insects exist in enormous numbers—estimated at 10^18 organisms with a biomass of 10^12 kg—making them a vast food resource. Many animals, including carp, opossums, frogs, lizards, birds, echidnas, anteaters, bats, and spiders, rely on insects as their primary diet, while others use them as a protein supplement, especially during breeding. Insectivorous plants, also called carnivorous plants, derive nutrients from trapping and consuming animals, particularly in nutrient-poor environments like acidic bogs. They use mechanisms such as pitfalls, sticky surfaces, and hair-trigger snaps. Though technically not strictly insectivorous (they consume any animal they can secure), the distinction is trivial because few insectivores eat only insects. The significance of insectivores lies in their ecological impact and evolutionary adaptations, from amphibians to specialized plants.

Did You Know?

• The global insect biomass is estimated at 10^12 kg (one billion tons) with a population of 10^18 organisms.
• The sloth bear is perhaps the largest insectivore.