Insects crepuscular

Chestnut cockchafer

Melolontha hippocastani

The Chestnut cockchafer is a jewel of the twilight, emerging from the earth after years of silence to take to the night skies. With its fan-like antennae and rich mahogany shell, it is a spectacular visitor to any forest-edge garden.

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Quick Identification

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Size

Body length of 20-25 mm (0.8-1.0 inches)

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Colors

Rich chestnut-brown elytra (wing covers) often with a black border; thorax is typically dark brown or black; white triangular spots along the abdomen's sides.

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Key Features

Fan-like 'lamellate' antennae with 6-7 leaves
Glossy chestnut-red wing covers
Blunt, rounded abdominal tip (pygidium) with a small knob
Dense, fine hair on the underside of the thorax

When You’ll See Them

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Activity pattern crepuscular

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Peak hours 8 PM - 11 PM

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Season May-June

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Diet Adults forage on the leaves of deciduous trees like oak, birch, and fruit trees; larvae (grubs) feed on tree and grass roots.

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Habitat Deciduous forest edges, sandy soils, suburban gardens, and wooded parks.

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Behavior

The Chestnut cockchafer is a fascinating beetle known for its multi-year life cycle, spending up to four years underground as a larva before emerging as a winged adult. Once they emerge in late spring, usually around May, they are highly active during the twilight hours. You will often hear them before you see them, as their large bodies create a distinct, heavy humming sound during flight. They are somewhat clumsy fliers and are notorious for accidentally bumping into windows or people as they navigate toward tree canopies.

In the adult stage, these beetles are primarily focused on two things: feeding on foliage and finding a mate. While they can appear in large numbers during 'flight years,' they are largely harmless to humans. They don't bite or sting, though their hooked legs can feel a bit 'scratchy' if they land on your skin. They serve as a vital food source for many backyard predators, including bats, owls, and hedgehogs.

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Camera Tips

Capturing the Chestnut cockchafer on a trail camera requires a different approach than filming mammals. Because they are attracted to light, placing your camera near an outdoor LED or UV light source is a great way to guarantee activity. If your camera has a 'macro' setting or a close-focus lens, use it; these beetles are small, and a standard trail cam may struggle to focus on anything closer than three feet. Try mounting your camera on a fence post or tree trunk facing a porch light to catch them as they land and crawl.

Since these beetles are most active at dusk, ensure your camera's trigger speed is set to its fastest possible interval. If you are using a camera with a motion sensor, be aware that insects sometimes fail to trigger the PIR sensor because they don't emit enough heat. To combat this, set your camera to 'Time Lapse' mode during the two hours surrounding sunset, taking a photo every 30 seconds. This increases your chances of catching them mid-flight or as they congregate on leaves.

For the best video footage, look for their preferred food sources. If you have an oak or beech tree with low-hanging branches, position the camera to look along the edge of the foliage. During a 'major' emergence year, you can capture spectacular footage of dozens of beetles swarming the canopy. Use a high-quality SD card with a fast write speed to ensure the video doesn't lag when the beetles are buzzing rapidly through the frame.

Lastly, consider the height of your placement. While they fly high in the trees, they often start their evening by crawling out of the grass. A ground-level camera angled slightly upward toward a light source can produce dramatic silhouettes of the beetles as they take off. If you're using infrared (IR) flash, be mindful of overexposure; their shiny chestnut wing covers can reflect the IR light and blow out the image, so try to keep the camera at least 2 feet away from the target landing spot.

Similar Species

Species that look similar or are commonly confused with Chestnut cockchafer.

Common cockchafer

The common cockchafer is slightly larger and has a much longer, pointed tip at the end of its abdomen without the 'knob' found on the chestnut species.

Summer chafer

Smaller than the Chestnut cockchafer and usually appears later in the year (June-July), with a hairier body and yellower wing covers.

Frequently Asked Questions

The Chestnut cockchafer is crepuscular, meaning it is most active during the twilight hours. You will typically see them swarming and flying from about 30 minutes after sunset until midnight.

To attract them, maintain a garden with deciduous trees like oak or birch and avoid using heavy pesticides in your soil. They are also naturally drawn to artificial light sources at night.

Adults eat the leaves of various broadleaf trees and shrubs. The larvae, known as white grubs, live underground and eat the roots of grasses and trees.

Yes, especially in suburbs that are near woodlands or have sandy soil. They are common across Europe and parts of Asia where their host trees are present.

The easiest way is the 'pygidium' (the tail end of the abdomen). In the Chestnut cockchafer, this tip is shorter and ends in a small, rounded knob, whereas the common cockchafer has a longer, more pointed tip.

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