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Walnut sphinx

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description Walnut sphinx Overview

The walnut sphinx (Amorpha juglandis) is a species of hawkmoth native to the deciduous forests of North America. The adult moth features brown, mottled wings that provide effective camouflage against tree bark, while its larvae primarily feed on the leaves of walnut, hickory, and other related trees. The caterpillars are known for a unique defensive behavior: when disturbed, they can forcibly expel air from their spiracles to produce a squeaking or whistling sound to deter predators. This moth is an interesting subject for entomologists and naturalists studying the ecological dynamics of forest ecosystems.

help Walnut sphinx FAQ

Why do walnut sphinx caterpillars make a squeaking sound?

When handled or threatened, the walnut sphinx caterpillar forces air out through its spiracles to create a high-pitched squeaking or whistling sound. This unusual defense mechanism is used to startle and deter potential predators.

What plants do walnut sphinx moth caterpillars eat?

The caterpillars primarily feed on trees in the Juglandaceae family, specifically consuming the leaves of walnut and hickory. They are defoliators that can strip branches bare, though they rarely cause long-term harm to mature trees.

What does the adult walnut sphinx moth look like?

Adult Amorpha juglandis moths typically have mottled brown and gray wings that resemble tree bark, allowing them to camouflage perfectly against branches. Like other hawkmoths, they have robust, streamlined bodies and relatively narrow wings.

Where can you find the walnut sphinx moth in the wild?

The walnut sphinx is native to North America and can be found throughout the eastern United States and parts of southern Canada. They prefer deciduous woodlands and forests where their host walnut and hickory trees grow abundantly.

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