Head to head
Banjo Frog vs Bullfrog
Banjo frog and bullfrog are both names built around a sound, a bonk in one case and a booming roar in the other, and both belong to stout, burrowing, big-mouthed frogs, but they are not related and live on different continents.
| Banjo Frog | Bullfrog | |
|---|---|---|
| What the name means | One Australian genus, Limnodynastes | Several large frogs worldwide |
| The call | A single low bonk, like a banjo string | A deep bellowing croak |
| Typical size | Modest, a few centimetres | Often large, especially African bullfrog |
| Range | Australia | Americas (Lithobates) and Africa (Pyxicephalus) |
| Diet | Mostly insects and other frogs | Large prey including rodents and snakes (African) |
| Burrowing | Digs backwards to survive dry spells | Digs backwards to survive dry spells |
| Breeding | Foam nest at the water surface | Eggs laid directly in water |
| Aggression | Mild-mannered | The African bullfrog is highly aggressive |
Banjo Frog vs Bullfrog: common questions
Is a banjo frog a kind of bullfrog?
No, they are unrelated and the similarity is only in having a distinctive, memorable call and a stout burrowing body. Banjo frog refers specifically to the Australian genus Limnodynastes, named for its plucked-string bonk call. Bullfrog is a much looser common name applied around the world to several large, deep-voiced frogs that are not each other's close relatives either, chiefly the American bullfrog in the genus Lithobates and the African bullfrog in the genus Pyxicephalus. None of these bullfrogs is a banjo frog, and the banjo frog is not classed as a bullfrog in any scientific sense, even though both names describe frogs recognised primarily by a powerful call.
Which is bigger, a banjo frog or a bullfrog?
The bullfrogs, especially the African bullfrog, are considerably bigger. A large male African bullfrog can weigh over a kilogram and is one of the largest frogs in the world, and the American bullfrog is also a substantial frog, commonly reaching close to 15 to 20 centimetres in body length. Banjo frogs are respectable-sized frogs for Australia but stay considerably smaller and lighter than either bullfrog, and none of the roughly five banjo frog species approaches the bulk of a big African or American bullfrog.
Do banjo frogs and bullfrogs behave similarly?
In some ways, yes. Both are burrowing frogs that dig themselves backward into soil to wait out dry conditions, both breed explosively in temporary or semi-permanent water after rain, and both are heavy-bodied ambush predators that sit and wait for prey rather than actively chasing it. The main behavioural difference is intensity and diet, since the African bullfrog in particular is notoriously aggressive, capable of eating other frogs, small reptiles, and rodents, and male African bullfrogs will fiercely guard tadpoles, digging channels to keep drying pools connected, behaviour far beyond anything recorded in the milder, mostly insect-eating banjo frogs.