Amphibians Active during the day

Pool Frog

Pelophylax lessonae

iNaturalist Wikipedia

The vibrant green gem of European wetlands, the Pool Frog is a sun-loving acrobat famous for its rhythmic rattling call and impressive basking habits. Once thought lost to the UK, this resilient species is making a splashy comeback in backyard ponds and nature reserves alike.

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Quick Identification

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Size

Small to medium frog, typically 5–9 cm (2–3.5 inches) in length; weighing 20–50 grams (0.7–1.8 oz)

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Colors

Usually bright grass-green or brownish-green with dark spots; often features a prominent yellow or pale green stripe down the center of the back (vertebral stripe); underbelly is creamy white without spots.

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Key Features

Distinct bright yellow or pale green line running down the spine
Prominent dorsolateral folds (ridges) along the sides of the back
Relatively short hind legs compared to other 'green frogs'
Loud, vocal sacs in males that are white or pale grey when inflated

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 10 AM - 4 PM (Basking), 7 PM - 11 PM (Calling/Feeding)

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Season May-August

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Diet Adults are opportunistic hunters that eat a variety of invertebrates including flies, beetles, spiders, and snails. They often hunt on land near the water's edge, using their powerful tongues to snatch prey.

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Habitat Sun-exposed, shallow, still water bodies such as garden ponds, fens, and ditches with abundant aquatic vegetation.

Behavior

Pool Frogs are sun-loving amphibians that spend a significant portion of their day basking on the edges of ponds or on floating vegetation like lily pads. They are primarily diurnal, meaning they are most active during daylight hours, though they may continue their activities into warm evenings. Unlike many other frog species that prefer damp, shaded areas, the Pool Frog thrives in the heat, using the sun to regulate its body temperature and fuel its metabolism.

During the breeding season, which typically occurs from May to July, males become highly territorial and vocal. They form 'choruses' near the water's edge, using their twin vocal sacs to produce a rhythmic, rattling call to attract females. Despite being quite social during the mating season, they remain wary of predators; at the slightest sign of danger, they will leap into the water with a characteristic 'plop' and hide in the silt at the bottom.

Interaction with humans is generally passive. In garden settings, they can become quite bold if they feel safe, allowing observers to watch their hunting and basking behaviors from a distance. Because they hibernate on land rather than in the water, the presence of log piles or loose soil near a pond is essential for their year-round survival in a backyard environment.

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Camera Tips

To capture the best footage of a Pool Frog, place your camera very low to the ground, ideally just a few inches above the water level at the edge of a pond. Focus your lens on a 'basking station'—this could be a flat rock, a half-submerged log, or a cluster of lily pads that receives direct sunlight for several hours a day. Because these frogs are small and cold-blooded, they may not always trigger traditional PIR (passive infrared) motion sensors. To combat this, use a camera with a high-sensitivity trigger or, better yet, set your device to time-lapse mode with intervals of 30 to 60 seconds during peak daylight hours.

If you are looking to record their famous vocalizations, placement is key during the late spring. Position the camera near the shallowest part of the pond where aquatic plants break the surface; this is where males tend to congregate to call. If your camera has a 'detect and record' video setting, ensure the microphone sensitivity is turned up, as the rattling call of the Pool Frog is distinctive but can be drowned out by wind or distant traffic.

For night-time captures, Pool Frogs are less active than at mid-day but may still be seen foraging on the bank. Use a camera with 'No-Glow' infrared LEDs to avoid startling them or washing out their reflective skin in the footage. Since they often return to the same basking spot day after day, once you identify a 'favorite' log, keep your camera there for at least a week to capture a full range of their behaviors, from hunting flies to interacting with other frogs.

Similar Species

Species that look similar or are commonly confused with Pool Frog.

Edible Frog

A hybrid of the Pool Frog and Marsh Frog, it is larger with longer hind legs and greyish vocal sacs.

Marsh Frog

Much larger (up to 15cm) with darker, more olive-brown skin and a much louder, 'laughing' call.

Common Frog

Brownish color with a dark 'mask' behind the eye and lacks the bright green coloration and vertebral stripe.

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Frequently Asked Questions

Pool Frog are primarily diurnal, meaning they are most active during the day. They spend the warmest hours, typically between 10 AM and 4 PM, basking in the sun to regulate their body temperature. During the breeding season, males may also be heard calling well into the evening.

To attract Pool Frog, create a shallow, sun-facing pond with plenty of aquatic plants like water lilies. Avoid adding fish, which eat frog spawn, and ensure there are log piles or tall grass nearby where they can safely hibernate during the winter months.

Pool Frog eat a diet of small invertebrates. This includes flying insects like flies and damselflies, as well as land-based prey like beetles, spiders, slugs, and snails. They are active hunters that often leap from the water's edge to catch prey.

Yes, Pool Frog can be very common in suburban areas if there is suitable standing water nearby. They are well-adapted to garden ponds, provided the water is clean, still, and receives plenty of sunlight.

The Pool Frog is generally smaller than the Edible Frog. The best way to distinguish them is by their hind legs; Pool Frog have much shorter calves and thighs. Additionally, Pool Frog usually have a brighter, more consistent yellow stripe down their back and white vocal sacs, whereas Edible Frogs have greyish ones.

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