Insects diurnal

Red-legged Marsh Beetle

Scirtes tibialis

A tiny master of the leap, the Red-legged Marsh Beetle brings a splash of color and incredible agility to the edges of your backyard pond. This pint-sized jumper is a key indicator of a healthy, thriving wetland ecosystem.

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Quick Identification

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Size

2.5–3.5 mm (0.10–0.14 inches) in length

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Colors

Dark brown to black body with contrasting reddish-orange or yellowish legs; antennae are typically dark at the tips and lighter at the base.

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Key Features

Broadly oval and convex body shape
Greatly enlarged hind femora (thighs) designed for jumping
Contrasting reddish-orange legs against a dark torso
Short, fine yellowish hairs visible under magnification

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10 AM – 4 PM

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Season May–August

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Diet Adults feed on decaying organic matter, algae, and soft plant tissues; larvae are aquatic scavengers that eat detritus and microscopic organisms.

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Habitat Wetlands, marshes, pond margins, and damp backyard gardens near water features.

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Behavior

The Red-legged Marsh Beetle is a remarkably agile insect, often nicknamed for its ability to leap like a flea. These beetles utilize their oversized hind legs to launch themselves into the air when threatened, making them difficult for predators—and photographers—to pin down. They are typically found in the transition zones between land and water, where they scurry across the surface of damp leaves and stems.

While the larvae are fully aquatic, the adults spend their lives in the humid microclimates of tall grasses, sedges, and wetland vegetation. They are most active during the warmest parts of the day, often seen basking or feeding on the undersides of foliage. They are not known to be social, typically appearing as solitary individuals or in small, unorganized groups where food is abundant.

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Camera Tips

Capturing the Red-legged Marsh Beetle requires a specialized approach because of its tiny size and habitat. Standard trail cameras will not trigger for an insect this small; instead, use an AI-powered macro camera or a lens setup specifically designed for close-up photography. Place your camera setup on a stable mini-tripod at the edge of a pond or marshy area, focusing on the leaves of aquatic plants like pickerelweed, sedges, or cattails. The lens should be positioned within 2 to 4 inches of the foliage for maximum detail.

Since these beetles are dark-colored and somewhat glossy, lighting is your biggest challenge. Harsh, direct midday sun can cause reflective 'hot spots' on their wing covers, obscuring the detail of their namesake red legs. Use a small diffuser or wait for slightly overcast conditions to achieve soft, even lighting that brings out the subtle textures and colors of the beetle's exoskeleton. Setting your camera to a fast shutter speed (at least 1/500s) is essential to catch them before they spring out of the frame.

To increase your chances of a sighting, look for 'seep' areas where the soil is constantly saturated. You can encourage them to stay in the frame by providing a damp piece of driftwood or a flat, mossy stone near the water's edge. Because they are attracted to high humidity, early morning before the dew evaporates is a great time to find them moving slowly, though they reach peak activity when the sun warms their environment. Keep your camera's motion sensitivity at its highest setting if using an AI trigger system.

Similar Species

Species that look similar or are commonly confused with Red-legged Marsh Beetle.

Flea Beetle

Flea beetles are typically more elongated and are often found on garden vegetables rather than near aquatic habitats.

Lesser Marsh Beetle

Similar in size but lacks the significantly thickened hind legs and the distinctively bright reddish leg coloration.

Frequently Asked Questions

Red-legged Marsh Beetles are diurnal and are most active during the warmest daylight hours, typically between 10 AM and 4 PM, when they can be found crawling on sun-warmed vegetation.

The best way to attract these beetles is to maintain a chemical-free backyard pond or a rain garden with native wetland plants like sedges, rushes, and marsh marigolds. They require damp environments to thrive.

Adults primarily eat decaying plant matter and algae found on the surfaces of leaves near water. Their larvae live underwater and act as tiny vacuum cleaners, eating organic detritus.

Yes, they are common throughout North America in any suburban environment that features standing water, drainage ditches, or consistently damp garden beds.

While both jump, Red-legged Marsh Beetles have a more broadly oval, 'turtle-like' body shape and are almost always found very close to water, whereas many flea beetles are found in drier garden patches on specific vegetable crops.

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