Cankerworm (Geometer moth larva)

Natural Habitat

Deciduous forests, orchards, and suburban gardens across North America

Diet & Feeding

Herbivorous; feeds on the leaves of deciduous trees including oak, maple, elm, and apple

Behavior Patterns

Commonly known as 'inchworms' due to their looping crawling motion; they can descend from tree canopies on silken threads when disturbed or seeking to pupate.

Risks & Benefits

Benefits the ecosystem as a primary food source for migratory birds; can be a pest in large numbers by defoliating trees, though healthy trees usually recover.

Identified on: 6/1/2026