Amphibians nocturnal

Dark-sided Chorus Frog

Microhyla heymonsi

Tiny, secretive, and surprisingly loud, the Dark-sided Chorus Frog is the hidden percussionist of the backyard. Its distinctive bracket-shaped markings and high-pitched call make it a favorite for nighttime wildlife observers.

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Quick Identification

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Size

1.5–3.0 cm (0.6–1.2 inches) in length

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Colors

Brownish or greyish base; distinct dark lateral stripes from snout to flank; light cream or yellowish vertebral line; dark 'parentheses' () mark on the back

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Key Features

Pointed snout and triangular body shape
Broad dark brown stripe running along the sides of the head and body
Distinctive dark mark on the back resembling two curved brackets
Lack of webbing on the fingers

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 8 PM - 2 AM, particularly during or after rainfall

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Season March-September, coinciding with rainy or monsoon seasons

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Diet Primarily myrmecophagous, meaning they specialize in eating ants and termites. They also consume other tiny soil-dwelling invertebrates found in leaf litter.

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Habitat Highly adaptable; found in suburban gardens, rice paddies, secondary forests, and grassy areas near temporary water sources.

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Behavior

The Dark-sided Chorus Frog is a master of stealth, spending much of its life hidden beneath damp leaf litter, logs, or within the cracks of garden soil. As a member of the narrow-mouthed frog family, it has a specialized lifestyle often centered around the consumption of tiny insects like ants. They are terrestrial and not particularly strong swimmers, preferring to stay on the ground rather than climbing or deep-water diving.

During the breeding season, their behavior shifts dramatically from solitary hiders to social vocalists. Males gather in large numbers around temporary pools or garden puddles, especially following heavy rainfall. Their synchronized calling creates a 'chorus' effect that can be heard from a significant distance, even though the individual frogs are barely an inch long. This collective behavior helps confuse predators and ensures that females can find the breeding site through the noise.

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Camera Tips

To capture the Dark-sided Chorus Frog on an AI-powered camera, ground-level placement is non-negotiable. These frogs do not climb; they stay at the soil level or just atop leaf litter. Mount your camera no more than 2 to 4 inches off the ground. If your camera setup allows, use a macro lens or a focal distance of 12-18 inches to ensure that these tiny subjects aren't just a blur in the frame. Point the lens toward the edge of a shallow water source, such as a garden saucer or a natural dip in the ground that collects rainwater.

Because these frogs are so small and cold-blooded, they may not always trigger a standard PIR (Passive Infrared) sensor on lower sensitivity. Set your camera's sensitivity to 'High.' A great trick for 'baiting' these frogs without food is to use a misting system or a simple garden sprinkler on a timer. The artificial 'rain' will often trick the frogs into emerging from their hiding spots to call or forage. If you are using a camera with a flash, ensure it is set to a low-intensity infrared mode so as not to startle them, though they are generally quite tolerant of non-visible IR light.

Video mode is significantly more effective than still photos for this species. Seeing the male's vocal sac expand—which can grow to nearly half the size of its body—is the best way to identify the species and document behavior. Set your video triggers for 15-20 seconds. If your camera records audio, listen for a high-pitched, rhythmic clicking or chirping that sounds more like a cricket than a typical 'bullfrog' croak. This audio is often the first sign that your camera is in the right spot.

Similar Species

Species that look similar or are commonly confused with Dark-sided Chorus Frog.

Ornate Chorus Frog

Lacks the bold, continuous dark stripe along the side and has a more complex, mottled pattern on its back.

Mukhlesur’s Chorus Frog

Almost identical in appearance but has a slightly different call frequency and is typically distinguished by DNA or specific regional range.

Frequently Asked Questions

Dark-sided Chorus Frogs are strictly nocturnal. You are most likely to see them or capture them on camera between 8 PM and 2 AM. Their activity peaks significantly during and immediately after heavy rain showers when the humidity is high.

The best way to attract them is to provide a 'wild' corner in your garden with damp leaf litter, some flat stones for hiding, and a shallow water source like a pond or even a plant saucer at ground level. Avoid using chemical pesticides, as these frogs rely on ants and small insects for food.

These frogs have very narrow mouths, which limits them to eating small prey. Their diet consists almost entirely of tiny ants, termites, and other small invertebrates found in the soil and leaf litter.

Yes, they are very common in suburban environments across Southeast Asia and parts of India. They are quite hardy and can thrive in human-modified landscapes as long as there is enough moisture and ground cover for them to hide.

Look for the very clear dark stripe that runs along the side of the body and the unique dark mark on the back that looks like a pair of parentheses (). Other chorus frogs usually have more mottled patterns or lack the distinct side-stripe.

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