Inchworm (Geometer moth caterpillar)

Scientific Name: Family Geometridae

Order & Family: Lepidoptera, Geometridae

Size: Typically 10mm to 50mm (about 0.4 to 2 inches) depending on species and growth stage.

Inchworm (Geometer moth caterpillar)

Natural Habitat

Deciduous and coniferous forests, gardens, and shrublands throughout the world.

Diet & Feeding

Herbivorous; most species feed on the leaves of trees and shrubs, including oak, maple, and fruit trees.

Behavior Patterns

Characterized by a 'looping' locomotion caused by lacking mid-body prolegs. They often use crypsis (camouflage) to look like small twigs when threatened.

Risks & Benefits

Generally harmless to humans. While they serve as a vital food source for birds, large population outbreaks can cause significant defoliation of forest or ornamental trees.

Identified on: 3/9/2026