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Alder moth

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description Alder moth Overview

The Alder moth (*Acronicta alni*) is a species of noctuid moth found across the Palearctic region, including Europe and parts of Asia. The adult moth possesses greyish, cryptic forewings that allow it to blend seamlessly into tree bark. Its most distinguishing feature is the larval stage, where the caterpillar transitions through various colorations, eventually displaying striking black and yellow patterns. These brightly colored caterpillars use Batesian mimicry to deter predators by imitating the appearance of toxic or unpalatable species, such as certain sawfly larvae.

help Alder moth FAQ

What is unique about the Alder moth caterpillar?

The Alder moth caterpillar undergoes a dramatic color change as it grows, eventually becoming strikingly colored in bright yellow and black. This vivid appearance allows it to defensively mimic toxic bug species to deter predators.

Where does the Alder moth live?

The Alder moth is a noctuid moth native to the Palearctic region, found throughout Europe and across to Japan. It typically resides in damp woodlands, forests, and wetlands where alder trees are prevalent.

When was the Alder moth first described?

The species was officially described in 1767, during the early period of modern taxonomic classification by Carl Linnaeus. It has remained a well-known species within the large family of owlet moths.

What does the adult Alder moth look like?

Despite its colorful larval stage, the adult Alder moth features cryptic, mottled grey and black wings that blend perfectly with tree bark. The adults rely entirely on this drab camouflage to hide from birds and other predators during the day.

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