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Mink Frog
Amphibians diurnal

Mink Frog

Lithobates septentrionalis

Often called the 'North Frog,' this aquatic specialist is famous for its unique onion-like scent and rhythmic hammering call. It is a master of camouflage, perfectly blending into the lily pads of northern wilderness ponds.

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Quick Identification

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Size

4.5 to 7.6 cm (1.8 to 3.0 inches); approximately 20 to 50 grams

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Colors

Olive to brownish-green with dark, irregular mottling or large spots. The belly is creamy white or pale yellow. Breeding males often feature a bright yellow throat.

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Key Features

  • Distinctive musky scent similar to rotting onions when handled
  • Interrupted or entirely absent dorsolateral folds along the back
  • Dark mottling on hind legs that does not form distinct bands
  • Large tympanum (ear drum) compared to eye size

When You’ll See Them

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Activity pattern diurnal
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Peak hours 10 AM - 4 PM for basking; dusk for vocalizing
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Season May-August
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Diet Primarily insectivorous, feeding on dragonflies, water striders, beetles, and flies. They also consume spiders, snails, and occasionally small fish or other tadpoles.
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Habitat Permanent bodies of water in northern regions, specifically boreal lakes, ponds, and slow-moving streams with abundant lily pads and pickerelweed.

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Behavior

The Mink Frog is a highly aquatic species that rarely ventures far from the water's edge. Unlike many other frogs that may travel through damp grass or woods, the Mink Frog prefers to stay semi-submerged or perched on floating vegetation. They are famously shy and alert; at the slightest sign of a predator or a human footfall, they will dive into the water with a quick splash, often remaining hidden at the bottom for several minutes.

These frogs are known for their social 'chorusing' during the summer months. The call of a male Mink Frog is quite distinct, sounding more like a rapid, rhythmic 'clucking' or the sound of two pieces of wood being struck together. This 'hammering' sound is a staple of northern wetlands during the breeding season. Because they are so tied to permanent water, they are excellent indicators of local water quality and ecosystem health.

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Camera Tips

Capturing a Mink Frog on camera requires a specialized setup focused on their favorite basking spots. Because they are almost entirely aquatic, your camera should be mounted very low to the ground or even on a floating platform at the water's edge. Aim your lens toward a cluster of lily pads or floating logs approximately 3 to 5 feet away. This is where they spend the majority of their daylight hours sunning themselves to regulate their body temperature.

Since these frogs are diurnal and love the sun, lighting is your biggest challenge. Direct sunlight hitting the water can cause significant glare that washes out the frog's intricate mottled patterns. To counter this, position your camera with the sun at your back, or use a polarizing filter if your camera housing allows it. Setting your camera to a higher shutter speed is also recommended, as it will help freeze the action if the frog suddenly leaps into the water, resulting in a crisp 'splash' photo rather than a blur.

While you can't use traditional bait for a Mink Frog, you can use light to your advantage. If you are setting your camera to run into the evening, placing a small, low-intensity LED light near your 'stage' area can attract the moths and flies that Mink Frogs love to eat. This creates a natural hunting ground that will keep the frog in the camera's field of view for longer periods. During the day, the best 'lure' is simply a quiet environment; Mink Frogs have excellent hearing, so avoid placing cameras in high-traffic areas where human footsteps might keep them underwater.

For the best results, use a camera with a fast trigger speed and set it to take short video clips (10-15 seconds). This allows you to capture the frog's unique behavior, such as its 'gulping' throat movements or the way it uses its front limbs to tuck food into its mouth. In terms of timing, late June through July is the peak of their activity when the water lilies are in full bloom, providing the perfect natural backdrop for your shots.

Similar Species

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

Green Frog

Green Frogs have prominent, continuous ridges (dorsolateral folds) running down their backs, while Mink Frogs have broken or missing ridges.

American Bullfrog

Bullfrogs grow much larger and lack the Mink Frog's characteristic dark mottling on the hind legs and the unique musky scent.

Frequently Asked Questions

Mink Frogs are primarily diurnal, which means they are most active during the day. You will most often see them basking on lily pads in the bright afternoon sun. However, their vocal choruses often peak during the twilight hours of early evening.
To attract Mink Frogs, you need a permanent pond with plenty of native aquatic vegetation. They specifically look for water lilies and other floating plants that offer basking spots and protection from predators. Avoid using lawn chemicals, as amphibians have porous skin that is sensitive to toxins.
They are opportunistic hunters that eat a variety of invertebrates. Their diet includes dragonflies, flies, beetles, spiders, and water striders. If it moves and fits in their mouth, a Mink Frog will likely try to eat it.
They are generally restricted to northern climates (Canada and the northern US) and are less common in developed suburban areas unless those areas are adjacent to large, permanent boreal wetlands or lakes.
Look at the ridges on the back (dorsolateral folds). In a Green Frog, these ridges are long and continuous from the eye to the hip. In a Mink Frog, these ridges are either absent or broken into short, 'interrupted' segments. Also, the Mink Frog's musky smell is a dead giveaway if you are close enough.

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