Amphibians diurnal

Black-spotted Frog

Pelophylax nigromaculatus

The Black-spotted Frog is a vibrant and iconic resident of East Asian wetlands, easily recognized by its striking leopard-like markings and its affinity for sun-drenched pond edges.

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Quick Identification

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Size

6-9 cm (2.4-3.5 inches) in length; weighing approximately 20-50 grams (0.7-1.8 oz)

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Colors

Bright green to olive or brownish-gray base with irregular large black spots; a distinct pale yellow or light green stripe runs down the spine; cream or white underbelly.

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Key Features

Large, irregular black spots across the back and legs
Prominent light-colored vertebral stripe
Raised skin ridges (dorsolateral folds) running down each side
Golden eyes with horizontal pupils

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10 AM - 4 PM for basking; 7 PM - 11 PM for nighttime activity and calling

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Season April-September

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Diet A generalist carnivore that uses a 'sit-and-wait' ambush strategy to catch beetles, flies, dragonflies, and spiders.

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Habitat Lowland wetlands, rice paddies, garden ponds, and slow-moving streams with plenty of vegetation.

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Behavior

The Black-spotted Frog is a highly active and skittish species known for its impressive leaping ability. Often found perched at the water’s edge, these frogs are professional baskers, soaking up sunlight during the day to regulate their body temperature. Despite their bold appearance, they are incredibly wary of predators; at the slightest vibration or shadow, they will launch themselves into the water with a characteristic 'plop' and hide in the substrate.

During the breeding season, which typically follows the first heavy rains of spring, males congregate in shallow waters to form choruses. Their call is a loud, rhythmic, and somewhat metallic croaking that can be heard from a significant distance. While they are social during the mating period, they are generally solitary hunters, maintaining a small home range where they wait for unsuspecting prey to wander within striking distance.

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Camera Tips

To capture the best footage of a Black-spotted Frog, position your camera at the water’s edge where the land meets a pond or rice paddy. These frogs love to bask in the sun on flat rocks or lily pads, so aim your lens at these potential sunning spots. Set the camera extremely low—just 2 to 5 inches off the ground—to get an eye-level perspective that reveals the intricate details of their skin texture and golden eyes.

While you cannot bait a frog with traditional food, you can attract their dinner to the camera's field of view. Placing a small, low-wattage solar light near the camera location will attract moths and other nocturnal insects, which in turn brings the frogs directly into your frame for a late-night snack. During the spring breeding season, ensure your camera is set to video mode with high-quality audio enabled to capture the males' distinctive, rapid-fire croaking.

Because these frogs are incredibly sensitive to movement, using a camera with a fast trigger speed (0.2 to 0.5 seconds) is essential. If your camera supports a 'Time Lapse' mode, consider setting it to take a photo every 5-10 minutes during peak basking hours (10 AM to 2 PM); this often captures natural behavior without being reliant on the motion sensor, which can sometimes be missed by smaller cold-blooded animals. In the heat of summer, focus your camera on damp mud patches or shaded areas near the water, as frogs will retreat there to stay cool and hydrated.

Similar Species

Species that look similar or are commonly confused with Black-spotted Frog.

Tokyo Pond Frog

Slightly smaller with more irregular, less distinct spotting and a shorter snout.

American Bullfrog

Much larger (up to 20cm) with a massive eardrum (tympanum) and lacking the distinct light dorsal stripe.

Japanese Wrinkled Frog

Has much rougher, 'wrinkled' skin and lacks the bright green coloration and bold black spots.

Frequently Asked Questions

The Black-spotted Frog is primarily diurnal, meaning it is most active during the day when it spends hours basking in the sun. However, during the spring breeding season, they become very active at night, with males calling loudly from dusk until midnight.

To attract these frogs, provide a permanent water source like a small pond with gently sloping sides. Avoid using pesticides in your garden, as these frogs rely on a healthy insect population for food, and ensure there are plenty of native aquatic plants for cover.

Black-spotted Frogs are insectivores that eat a wide variety of invertebrates. Their diet consists mainly of beetles, flies, dragonflies, moths, and spiders, which they catch using their long, sticky tongues.

Yes, they are highly adaptable and are frequently found in suburban gardens, parks, and agricultural areas like rice paddies, provided there is a nearby source of standing or slow-moving water.

The Black-spotted Frog usually has more prominent, darker spots and a more defined light-colored stripe down its back compared to the Tokyo Pond Frog (Pelophylax porosus), which often has a more mottled or less organized pattern.

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