Cane toads are native to Central and South America but now live on every continent except Antarctica, thanks to deliberate introductions that backfired spectacularly. Their natural range stretches from northern Argentina through Brazil, Colombia, Venezuela, and Central America, reaching as far north as a handful of counties in extreme southern Texas. Outside that range, they have established invasive populations across the Caribbean, Pacific islands, the Philippines, and most famously, a vast swath of northeastern Australia that keeps expanding.
Native Range in the Americas
In the wild, cane toads are found throughout much of South America east of the Andes. That includes Argentina, Bolivia, Brazil, Ecuador, Colombia, Paraguay, Peru, Venezuela, the Guianas, and Trinidad and Tobago. They extend through Central America and Mexico, with their northernmost natural foothold in six counties of extreme southern Texas: Cameron, Hidalgo, Jim Hogg, Starr, Webb, and Zapata. These are all warm, low-elevation areas along or near the Rio Grande.
Within this native range, cane toads occupy surprisingly varied terrain. Radiotelemetry studies in French Guiana found them living along sandy coastlines, sheltering in pools of fresh or brackish water during the day and foraging on beaches at night. Deeper inland, they shelter under the forest canopy and move into open clearings after dark. They are not strictly a jungle animal. They do well in savannas, grasslands, agricultural land, and disturbed areas near human development.
Where They’ve Invaded
Starting in the 1930s, cane toads were shipped around the world as a biological pest control for sugarcane beetles. The plan rarely worked, but the toads thrived anyway. Today, established invasive populations exist in Australia, Hawaii, Florida, several Caribbean islands (including Jamaica, Puerto Rico, and Barbados), Fiji, Papua New Guinea, and the Philippines, among other locations.
Australia’s invasion is the most well-documented. About 100 toads were released in Queensland in 1935. From that single introduction, cane toads have spread across most of tropical and subtropical eastern and northern Australia. In February 2009, the invasion front crossed into Western Australia from the Northern Territory, more than 2,000 kilometers from where they were originally released 74 years earlier. To the south, toads were introduced to Byron Bay in 1965 and had reached Port Macquarie on the New South Wales coast by 2003.
In the United States, Florida hosts a well-established population, though cold winter temperatures restrict their active season to roughly March through October. Southern Texas has both native and potentially expanding populations.
How Fast the Invasion Spreads
Cane toads at the leading edge of an invasion move faster than those behind it, a phenomenon that has accelerated their spread over time. In Australia, the northwestern front now advances more than 50 kilometers per year, up from fewer than 15 kilometers per year in earlier decades. The southern front, where cooler temperatures create a natural barrier, creeps along at fewer than 10 kilometers per year. This acceleration happens because the fastest-moving toads at the front end up breeding with each other, producing offspring with longer legs and greater endurance for dispersal.
Habitats They Prefer
Cane toads are generalists. They thrive in tropical and subtropical lowlands, but the key requirements are warmth, moisture, and access to standing water for breeding. Their preferred body temperature sits around 25°C (77°F), and they struggle when temperatures stay below about 10 to 15°C (50 to 59°F) for extended periods. Cold is the main factor limiting their southward expansion in both Australia and the United States.
During the day, cane toads hide in damp shelters to prevent water loss through their skin. In natural settings, these retreats include burrows alongside ponds, rock crevices, fallen logs, and shallow pools. In urban and suburban areas, they readily adopt human-made structures: garden sheds, drains, irrigation pipes, dog bowls, and the damp spaces beneath air conditioning units. This adaptability to human landscapes is a big part of why they spread so successfully.
At night, they emerge to feed on insects, spiders, and occasionally small vertebrates. Coastal populations forage on open beaches; forest populations move from tree cover into adjacent clearings.
Breeding Sites and Water Needs
Cane toads breed in almost any shallow, still water. Inland populations use temporary rain puddles, open marshes, and pools left behind as rivers dry. In urban areas, they spawn in human-made ponds and drainage ditches. Coastal populations in South America breed in pools separated from the ocean by sand banks and in rock pools along the shore.
While they typically spawn in freshwater, cane toads show a notable tolerance for salt. Coastal breeding pools in French Guiana experience tidal inflows that temporarily push salinity to full ocean levels (around 35 parts per thousand). Tadpoles survive at salinities up to about 6 parts per thousand, which is roughly one-sixth the concentration of seawater. This brackish tolerance gives them access to breeding habitats that most frogs and toads cannot use, further expanding the range of places they can colonize.
What Limits Their Range
Despite their reputation as unstoppable invaders, cane toads do have geographic limits. Cold is the biggest constraint. In Florida, winter temperatures shut down their activity for roughly five months. In southern Australia, the cooler climate has slowed the invasion front to a crawl. Mountain ranges also act as barriers: in South America, cane toads are found east of the Andes but not in the high-altitude interior. They are lowland animals that depend on warm nights and reliable moisture.
Dry conditions matter, too. Cane toads lose water rapidly through their skin compared to many other amphibians, which is why they seek out damp hiding spots during the day. Arid landscapes without dependable water sources are effectively off-limits. In northern Australia, the toads leapfrog between water points along rivers and human infrastructure like cattle troughs and irrigation systems, using artificial water sources as stepping stones through otherwise hostile terrain.