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American Bullfrog
Amphibians nocturnal

American Bullfrog

Lithobates catesbeianus

The heavyweight champion of the pond, the American Bullfrog is as famous for its deep, resonant 'jug-o-rum' call as it is for its impressive size and voracious appetite.

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Quick Identification

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Size

3.5 to 8 inches (9 to 20 cm) in length; weighing up to 1.1 lbs (0.5 kg)

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Colors

Varies from vibrant green to olive or brownish-grey with dark mottling; white or cream bellies; males feature bright yellow throats during the breeding season

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Key Features

  • Massive circular tympanum (eardrum) larger than or equal to the eye
  • Lack of dorsolateral ridges along the back (folds wrap around the ear instead)
  • Broad, flat head with a wide mouth
  • Heavy, muscular hind legs with extensive webbing

When You’ll See Them

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Activity pattern nocturnal
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Peak hours 8 PM - 4 AM
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Season May - August
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Diet Aggressive generalist carnivores; they will eat anything they can swallow, including insects, crayfish, small fish, snakes, birds, and even other frogs.
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Habitat Permanent freshwater bodies like ponds, lakes, marshes, and slow-moving streams; also common in backyard koi ponds and garden water features.

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Behavior

American Bullfrogs are the ultimate sit-and-wait predators of the wetlands. They spend much of their time motionless near the water's edge or among lily pads, eyes scanning for any movement. They are famously territorial; males will aggressively defend their 'calling stations' from rivals, sometimes engaging in physical wrestling matches that look like miniature sumo bouts.

During the spring and summer breeding seasons, their social life revolves around the water. The deep, bass-heavy 'bellow' of the male is designed to carry over long distances through the night air to attract females and warn off other males. While they are generally shy around humans, they are bold in their own domain, often staying still until the very last moment before leaping into the safety of deep water with a loud splash.

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Camera Tips

Capturing high-quality footage of an American Bullfrog requires a different strategy than scouting for mammals. Because they are cold-blooded, they may not always trigger a standard PIR (Passive Infrared) motion sensor, especially if the air temperature matches their body temperature. To combat this, set your camera to its highest sensitivity level or, ideally, use a 'time-lapse' mode that captures a frame every 30 to 60 seconds. This ensures you catch them even when they are sitting perfectly still for long periods of time.

Placement is the most critical factor for a great shot. Avoid mounting your camera on a high tree looking down; instead, use a short tripod or a ground stake to position the lens just 4 to 6 inches above the water level at the pond’s edge. Focus on 'basking stations'—flat rocks, partially submerged logs, or clear patches of mud where you’ve seen them sitting during the day. Angling the camera parallel to the shoreline will give you the best profile shots and capture the dramatic lunges they make when hunting.

If you want to record their famous vocalizations, ensure your camera has a shielded microphone and place it near a cluster of aquatic vegetation where males like to hide while calling. The best footage usually occurs on warm, humid nights immediately following a rainstorm, as this is when Bullfrogs are most active and mobile. For a unique perspective, try a 'split-shot' setup if you have a waterproof housing, positioning the lens half-in and half-out of the water to see both their surface behavior and their powerful swimming strokes below.

Similar Species

Species that look similar or are commonly confused with American Bullfrog.

Green Frog

Green Frogs have prominent ridges running down the sides of their backs, whereas Bullfrogs are smooth-backed.

Northern Leopard Frog

Leopard Frogs are much smaller and covered in distinct dark, light-bordered spots, resembling a leopard's coat.

Frequently Asked Questions

American Bullfrogs are primarily nocturnal, with their most intense activity occurring from dusk until the early morning hours. However, they are often seen during the day basking in the sun to regulate their body temperature.
To attract American Bullfrogs, you need a permanent water source that is at least two feet deep in some areas to allow for overwintering. Planting native aquatic vegetation like lily pads and pickerelweed provides the cover they need to feel safe and hunt successfully.
They are famous for their 'if it fits in the mouth, it's food' mentality. Their diet includes beetles, dragonflies, and worms, but larger individuals will regularly eat small fish, turtles, rodents, and even small birds or other frogs.
Yes, they are very adaptable and are frequently found in suburban garden ponds, drainage ditches, and golf course water hazards, provided the water is permanent and doesn't dry up in the summer.
The easiest way is to look at the ridges on their back. Green Frogs have two distinct ridges (dorsolateral folds) running down their sides. American Bullfrogs lack these ridges; instead, they have a small fold of skin that wraps tightly around the back of their ear (tympanum).

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