A bullfrog is a large, heavy-bodied frog known for its deep, resonant call that sounds like a bull’s bellow — hence the name. The American bullfrog (Lithobates catesbeianus) is the most famous species, native to eastern North America but now found worldwide thanks to the aquarium trade and frog-leg farming.
Bullfrogs are voracious predators: they’ll eat anything they can fit in their mouths, including insects, small fish, birds, snakes, and even other frogs. An adult can reach 20 cm (8 inches) in length and weigh over half a kilogram, making them one of the largest frog species on Earth.
Why It Matters
Bullfrogs are an ecological paradox. In their native range, they’re a beloved part of wetland ecosystems and a classic symbol of American summer nights. But as an invasive species in places like Europe, Asia, and western North America, they outcompete and consume native amphibians, driving some species toward extinction.
Their call is also one of the most recognizable sounds in nature documentaries — the deep “jug-o-rum” that signals warm evenings near ponds.
Examples
- Invasive bullfrogs in Europe: Established populations in France, Italy, and Belgium threaten native frogs.
- Frog legs: Bullfrogs are farmed extensively for their meaty hind legs.
- “Bullfrog” in music: A reference in blues and folk songs to deep, rumbling sounds.
Related Terms
- Amphibian, wetland, invasive species
- Tadpole, metamorphosis
- Frog legs, ecosystem