American Bullfrog (Lithobates catesbeianus) lives in freshwater habitats across Eastern North America. It feeds on insects and fish. Its conservation status is Least Concern.
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A real field recording of the American Bullfrog, made in the wild.
They measure about 3.6 to 6 in (9 to 15 cm) in snout-to-vent length, yet some individuals have been recorded at 8 in (20 cm) and 800 g (1.8 lb). Typical adults weigh up to 500 g (1.1 lb) and reach 203 mm in length, while the species' average length ranges from 90 to 152 mm.
More than 40 countries now host wild bullfrogs, turning a regional pond dweller into a global invader. Humans have moved them to places like California, Colorado (early 1900's), the Caribbean, South America, Asia and Europe, where they thrive in pools, canals and even koi ponds. Their sheer numbers and voracious appetite let them outcompete native frogs, alter food webs and spread disease.
A single female can lay a staggering 1,000-40,000 eggs that hatch in just 3-5 days, flooding ponds with a massive next generation. In the south, breeding can stretch from February to October, while northern populations spawn from May to July. This prolific output, combined with rapid growth, fuels explosive population booms that overwhelm native amphibians and accelerate the frog's spread into new habitats.
In the wild, bullfrogs usually live seven to nine years, but in captivity they can survive, with the longest recorded individual reaching 16 years. This longevity means a single frog can reproduce for many seasons, continually adding thousands of eggs to the environment.
Bullfrogs are now linked to the spread of deadly ranavirus in Brazil, the first wild amphibian outbreak recorded there. Researchers found ranavirus DNA in both native tadpoles and escaped farmed bullfrog tadpoles, suggesting the invasive species can carry and disseminate the pathogen across ecosystems, compounding the global amphibian decline caused by emerging diseases.
Sources
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In the languid waters of North America, the American Bullfrog reigns as a voracious and cunning hunter, its stout body undulating through the aquatic vegetation with a slow, deliberate grace. With eyes that seem to gleam like golden jewels in the sunlight, this formidable amphibian navigates its domain with a quiet confidence, its powerful legs coiled and ready to strike with deadly precision. As it moves through the murky shallows, its deep, resonant call echoes through the landscape, a primal declaration of its unyielding presence in this sun-dappled world.
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