There are many creatures that rely on leaves for food and shelter, including pollinators and other beneficial insects. Bumblebees, which over the winter build holes in the ground, use leaves to provide a cozy blanket protecting against hard freezes. And fireflies are among the insects that lay their eggs on leaves. The carnivorous larvae will feed on prey found in the leaf litter, including
worms and slugs. When we bag the leaves, we bag those insects.